Bring back Duration construction extensions KT-46229

Return the extension properties for constructing Duration from numbers,
but this time place them in Duration.Companion rather than on top-level.

- provide the new set of construction extension properties
  in companion of Duration
- leave top-level extension properties experimental,
  increase their deprecation level to ERROR,
  propose the extension properties in companion instead.
- leave Duration companion static factory functions experimental,
  deprecate them and propose the extension properties in companion instead.

libraries/stdlib/api/js-v1/kotlin.time.kt

@@ -1,106 +1,127 @@
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.days() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.days(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.days' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.days", imports = {"kotlin.time.Duration.Companion.days"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.days: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.days() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.days(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.days' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.days", imports = {"kotlin.time.Duration.Companion.days"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.days: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.days() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.days(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.days' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.days", imports = {"kotlin.time.Duration.Companion.days"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.days: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.hours() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.hours(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.hours' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.hours", imports = {"kotlin.time.Duration.Companion.hours"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.hours: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.hours() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.hours(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.hours' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.hours", imports = {"kotlin.time.Duration.Companion.hours"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.hours: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.hours() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.hours(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.hours' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.hours", imports = {"kotlin.time.Duration.Companion.hours"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.hours: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.microseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.microseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.microseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.microseconds", imports = {"kotlin.time.Duration.Companion.microseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.microseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.microseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.microseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.microseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.microseconds", imports = {"kotlin.time.Duration.Companion.microseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.microseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.microseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.microseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.microseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.microseconds", imports = {"kotlin.time.Duration.Companion.microseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.microseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.milliseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.milliseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.milliseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.milliseconds", imports = {"kotlin.time.Duration.Companion.milliseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.milliseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.milliseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.milliseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.milliseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.milliseconds", imports = {"kotlin.time.Duration.Companion.milliseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.milliseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.milliseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.milliseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.milliseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.milliseconds", imports = {"kotlin.time.Duration.Companion.milliseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.milliseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.minutes() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.minutes(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.minutes' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.minutes", imports = {"kotlin.time.Duration.Companion.minutes"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.minutes: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.minutes() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.minutes(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.minutes' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.minutes", imports = {"kotlin.time.Duration.Companion.minutes"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.minutes: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.minutes() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.minutes(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.minutes' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.minutes", imports = {"kotlin.time.Duration.Companion.minutes"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.minutes: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.nanoseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.nanoseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.nanoseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.nanoseconds", imports = {"kotlin.time.Duration.Companion.nanoseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.nanoseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.nanoseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.nanoseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.nanoseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.nanoseconds", imports = {"kotlin.time.Duration.Companion.nanoseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.nanoseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.nanoseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.nanoseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.nanoseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.nanoseconds", imports = {"kotlin.time.Duration.Companion.nanoseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.nanoseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.seconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.seconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.seconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.seconds", imports = {"kotlin.time.Duration.Companion.seconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.seconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.seconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.seconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.seconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.seconds", imports = {"kotlin.time.Duration.Companion.seconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.seconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.seconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.seconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.seconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.seconds", imports = {"kotlin.time.Duration.Companion.seconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.seconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
@@ -279,60 +300,177 @@ public final inline class Duration : kotlin.Comparable<kotlin.time.Duration> {
 
         public final val ZERO: kotlin.time.Duration { get; }
 
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.days: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.days: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.days: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.hours: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.hours: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.hours: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.microseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.microseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.microseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.milliseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.milliseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.milliseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.minutes: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.minutes: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.minutes: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.nanoseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.nanoseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.nanoseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.seconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.seconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.seconds: kotlin.time.Duration { get; }
+
         public final fun convert(value: kotlin.Double, sourceUnit: kotlin.time.DurationUnit, targetUnit: kotlin.time.DurationUnit): kotlin.Double
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.days' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.days", imports = {"kotlin.time.Duration.Companion.days"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun days(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.days' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.days", imports = {"kotlin.time.Duration.Companion.days"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun days(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.days' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.days", imports = {"kotlin.time.Duration.Companion.days"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun days(value: kotlin.Long): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.hours' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.hours", imports = {"kotlin.time.Duration.Companion.hours"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun hours(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.hours' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.hours", imports = {"kotlin.time.Duration.Companion.hours"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun hours(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.hours' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.hours", imports = {"kotlin.time.Duration.Companion.hours"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun hours(value: kotlin.Long): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.microseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.microseconds", imports = {"kotlin.time.Duration.Companion.microseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun microseconds(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.microseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.microseconds", imports = {"kotlin.time.Duration.Companion.microseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun microseconds(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.microseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.microseconds", imports = {"kotlin.time.Duration.Companion.microseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun microseconds(value: kotlin.Long): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.milliseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.milliseconds", imports = {"kotlin.time.Duration.Companion.milliseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun milliseconds(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.milliseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.milliseconds", imports = {"kotlin.time.Duration.Companion.milliseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun milliseconds(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.milliseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.milliseconds", imports = {"kotlin.time.Duration.Companion.milliseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun milliseconds(value: kotlin.Long): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.minutes' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.minutes", imports = {"kotlin.time.Duration.Companion.minutes"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun minutes(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.minutes' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.minutes", imports = {"kotlin.time.Duration.Companion.minutes"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun minutes(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.minutes' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.minutes", imports = {"kotlin.time.Duration.Companion.minutes"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun minutes(value: kotlin.Long): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.nanoseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.nanoseconds", imports = {"kotlin.time.Duration.Companion.nanoseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun nanoseconds(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.nanoseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.nanoseconds", imports = {"kotlin.time.Duration.Companion.nanoseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun nanoseconds(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.nanoseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.nanoseconds", imports = {"kotlin.time.Duration.Companion.nanoseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun nanoseconds(value: kotlin.Long): kotlin.time.Duration
 
         public final fun parse(value: kotlin.String): kotlin.time.Duration
@@ -344,12 +482,21 @@ public final inline class Duration : kotlin.Comparable<kotlin.time.Duration> {
         public final fun parseOrNull(value: kotlin.String): kotlin.time.Duration?
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.seconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.seconds", imports = {"kotlin.time.Duration.Companion.seconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun seconds(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.seconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.seconds", imports = {"kotlin.time.Duration.Companion.seconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun seconds(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.seconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.seconds", imports = {"kotlin.time.Duration.Companion.seconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun seconds(value: kotlin.Long): kotlin.time.Duration
     }
 }

libraries/stdlib/api/js/kotlin.time.kt

@@ -1,106 +1,127 @@
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.days() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.days(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.days' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.days", imports = {"kotlin.time.Duration.Companion.days"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.days: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.days() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.days(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.days' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.days", imports = {"kotlin.time.Duration.Companion.days"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.days: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.days() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.days(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.days' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.days", imports = {"kotlin.time.Duration.Companion.days"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.days: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.hours() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.hours(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.hours' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.hours", imports = {"kotlin.time.Duration.Companion.hours"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.hours: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.hours() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.hours(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.hours' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.hours", imports = {"kotlin.time.Duration.Companion.hours"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.hours: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.hours() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.hours(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.hours' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.hours", imports = {"kotlin.time.Duration.Companion.hours"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.hours: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.microseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.microseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.microseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.microseconds", imports = {"kotlin.time.Duration.Companion.microseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.microseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.microseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.microseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.microseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.microseconds", imports = {"kotlin.time.Duration.Companion.microseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.microseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.microseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.microseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.microseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.microseconds", imports = {"kotlin.time.Duration.Companion.microseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.microseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.milliseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.milliseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.milliseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.milliseconds", imports = {"kotlin.time.Duration.Companion.milliseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.milliseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.milliseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.milliseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.milliseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.milliseconds", imports = {"kotlin.time.Duration.Companion.milliseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.milliseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.milliseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.milliseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.milliseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.milliseconds", imports = {"kotlin.time.Duration.Companion.milliseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.milliseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.minutes() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.minutes(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.minutes' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.minutes", imports = {"kotlin.time.Duration.Companion.minutes"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.minutes: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.minutes() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.minutes(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.minutes' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.minutes", imports = {"kotlin.time.Duration.Companion.minutes"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.minutes: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.minutes() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.minutes(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.minutes' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.minutes", imports = {"kotlin.time.Duration.Companion.minutes"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.minutes: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.nanoseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.nanoseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.nanoseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.nanoseconds", imports = {"kotlin.time.Duration.Companion.nanoseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.nanoseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.nanoseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.nanoseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.nanoseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.nanoseconds", imports = {"kotlin.time.Duration.Companion.nanoseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.nanoseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.nanoseconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.nanoseconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.nanoseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.nanoseconds", imports = {"kotlin.time.Duration.Companion.nanoseconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.nanoseconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.seconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.seconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Double.seconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.seconds", imports = {"kotlin.time.Duration.Companion.seconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Double.seconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.seconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.seconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Int.seconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.seconds", imports = {"kotlin.time.Duration.Companion.seconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Int.seconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
 @kotlin.time.ExperimentalTime
-@kotlin.Deprecated(message = "Use Duration.seconds() function instead.", replaceWith = kotlin.ReplaceWith(expression = "Duration.seconds(this)", imports = {"kotlin.time.Duration"}))
+@kotlin.Deprecated(message = "Use 'Long.seconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "this.seconds", imports = {"kotlin.time.Duration.Companion.seconds"}))
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.6", warningSince = "1.5")
 public val kotlin.Long.seconds: kotlin.time.Duration { get; }
 
 @kotlin.SinceKotlin(version = "1.3")
@@ -279,60 +300,177 @@ public final inline class Duration : kotlin.Comparable<kotlin.time.Duration> {
 
         public final val ZERO: kotlin.time.Duration { get; }
 
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.days: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.days: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.days: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.hours: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.hours: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.hours: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.microseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.microseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.microseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.milliseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.milliseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.milliseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.minutes: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.minutes: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.minutes: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.nanoseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.nanoseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.nanoseconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Double.seconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Int.seconds: kotlin.time.Duration { get; }
+
+        @kotlin.internal.InlineOnly
+        public final val kotlin.Long.seconds: kotlin.time.Duration { get; }
+
         public final fun convert(value: kotlin.Double, sourceUnit: kotlin.time.DurationUnit, targetUnit: kotlin.time.DurationUnit): kotlin.Double
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.days' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.days", imports = {"kotlin.time.Duration.Companion.days"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun days(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.days' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.days", imports = {"kotlin.time.Duration.Companion.days"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun days(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.days' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.days", imports = {"kotlin.time.Duration.Companion.days"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun days(value: kotlin.Long): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.hours' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.hours", imports = {"kotlin.time.Duration.Companion.hours"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun hours(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.hours' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.hours", imports = {"kotlin.time.Duration.Companion.hours"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun hours(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.hours' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.hours", imports = {"kotlin.time.Duration.Companion.hours"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun hours(value: kotlin.Long): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.microseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.microseconds", imports = {"kotlin.time.Duration.Companion.microseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun microseconds(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.microseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.microseconds", imports = {"kotlin.time.Duration.Companion.microseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun microseconds(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.microseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.microseconds", imports = {"kotlin.time.Duration.Companion.microseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun microseconds(value: kotlin.Long): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.milliseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.milliseconds", imports = {"kotlin.time.Duration.Companion.milliseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun milliseconds(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.milliseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.milliseconds", imports = {"kotlin.time.Duration.Companion.milliseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun milliseconds(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.milliseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.milliseconds", imports = {"kotlin.time.Duration.Companion.milliseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun milliseconds(value: kotlin.Long): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.minutes' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.minutes", imports = {"kotlin.time.Duration.Companion.minutes"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun minutes(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.minutes' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.minutes", imports = {"kotlin.time.Duration.Companion.minutes"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun minutes(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.minutes' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.minutes", imports = {"kotlin.time.Duration.Companion.minutes"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun minutes(value: kotlin.Long): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.nanoseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.nanoseconds", imports = {"kotlin.time.Duration.Companion.nanoseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun nanoseconds(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.nanoseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.nanoseconds", imports = {"kotlin.time.Duration.Companion.nanoseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun nanoseconds(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.nanoseconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.nanoseconds", imports = {"kotlin.time.Duration.Companion.nanoseconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun nanoseconds(value: kotlin.Long): kotlin.time.Duration
 
         public final fun parse(value: kotlin.String): kotlin.time.Duration
@@ -344,12 +482,21 @@ public final inline class Duration : kotlin.Comparable<kotlin.time.Duration> {
         public final fun parseOrNull(value: kotlin.String): kotlin.time.Duration?
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Double.seconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.seconds", imports = {"kotlin.time.Duration.Companion.seconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun seconds(value: kotlin.Double): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Int.seconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.seconds", imports = {"kotlin.time.Duration.Companion.seconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun seconds(value: kotlin.Int): kotlin.time.Duration
 
         @kotlin.SinceKotlin(version = "1.5")
+        @kotlin.time.ExperimentalTime
+        @kotlin.Deprecated(message = "Use 'Long.seconds' extension property from Duration.Companion instead.", replaceWith = kotlin.ReplaceWith(expression = "value.seconds", imports = {"kotlin.time.Duration.Companion.seconds"}))
+        @kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
         public final fun seconds(value: kotlin.Long): kotlin.time.Duration
     }
 }

libraries/stdlib/jdk8/test/time/DurationConversionTest.kt

@@ -8,6 +8,9 @@ package kotlin.jdk8.time.test
 import kotlin.random.Random
 import kotlin.test.*
 import kotlin.time.*
+import kotlin.time.Duration.Companion.days
+import kotlin.time.Duration.Companion.nanoseconds
+import kotlin.time.Duration.Companion.seconds
 import java.time.Duration as JTDuration
 
 class DurationConversionTest {
@@ -15,7 +18,7 @@ class DurationConversionTest {
     fun twoWayConversion() {
         fun test(days: Int, hours: Int, minutes: Int, seconds: Int, millis: Int, nanos: Int) {
             val duration = with(Duration) {
-                days(days) + hours(hours) + minutes(minutes) + seconds(seconds) + milliseconds(millis) + nanoseconds(nanos)
+                days.days + hours.hours + minutes.minutes + seconds.seconds + millis.milliseconds + nanos.nanoseconds
             }
             val jtDuration = JTDuration.ZERO
                 .plusDays(days.toLong())
@@ -50,12 +53,12 @@ class DurationConversionTest {
         val duration1 = jtDuration1.toKotlinDuration()
         val duration2 = jtDuration1.toKotlinDuration()
         assertEquals(duration1, duration2)
-        assertEquals(Duration.days(365 * 150), duration2)
+        assertEquals((365 * 150).days, duration2)
     }
 
     @Test
     fun kotlinToJavaClamping() {
-        val duration = Duration.seconds(Long.MAX_VALUE) * 5
+        val duration = Long.MAX_VALUE.seconds * 5
         val jtDuration = duration.toJavaDuration()
         assertEquals(JTDuration.ofSeconds(Long.MAX_VALUE), jtDuration)
 
@@ -66,7 +69,7 @@ class DurationConversionTest {
     @Test
     fun randomIsoConversionEquivalence() {
         repeat(100) {
-            val duration = Duration.nanoseconds(Random.nextLong(-(1L shl 53) + 1, 1L shl 53))
+            val duration = Random.nextLong(-(1L shl 53) + 1, 1L shl 53).nanoseconds
             val fromString = JTDuration.parse(duration.toIsoString())
             val fromDuration = duration.toJavaDuration()
 

libraries/stdlib/js/src/kotlin/time/MonoTimeSource.kt

@@ -37,7 +37,7 @@ internal class HrTimeSource(val process: Process) : TimeSource {
     override fun markNow(): TimeMark = object : TimeMark() {
         val startedAt = process.hrtime()
         override fun elapsedNow(): Duration =
-            process.hrtime(startedAt).let { (seconds, nanos) -> Duration.seconds(seconds) + Duration.nanoseconds(nanos) }
+            process.hrtime(startedAt).let { (seconds, nanos) -> seconds.toDuration(DurationUnit.SECONDS) + nanos.toDuration(DurationUnit.NANOSECONDS) }
     }
 
     override fun toString(): String = "TimeSource(process.hrtime())"

libraries/stdlib/samples/test/samples/time/durations.kt

@@ -9,37 +9,42 @@ import samples.*
 import kotlin.test.*
 
 import kotlin.time.*
+import kotlin.time.Duration.Companion.days
+import kotlin.time.Duration.Companion.milliseconds
+import kotlin.time.Duration.Companion.minutes
+import kotlin.time.Duration.Companion.nanoseconds
+import kotlin.time.Duration.Companion.seconds
 
 class Durations {
 
     @Sample
     fun toIsoString() {
-        assertPrints(Duration.nanoseconds(25).toIsoString(), "PT0.000000025S")
+        assertPrints(25.nanoseconds.toIsoString(), "PT0.000000025S")
-        assertPrints(Duration.milliseconds(120.3).toIsoString(), "PT0.120300S")
+        assertPrints(120.3.milliseconds.toIsoString(), "PT0.120300S")
-        assertPrints(Duration.seconds(30.5).toIsoString(), "PT30.500S")
+        assertPrints(30.5.seconds.toIsoString(), "PT30.500S")
-        assertPrints(Duration.minutes(30.5).toIsoString(), "PT30M30S")
+        assertPrints(30.5.minutes.toIsoString(), "PT30M30S")
-        assertPrints(Duration.seconds(86420).toIsoString(), "PT24H0M20S")
+        assertPrints(86420.seconds.toIsoString(), "PT24H0M20S")
-        assertPrints(Duration.days(2).toIsoString(), "PT48H")
+        assertPrints(2.days.toIsoString(), "PT48H")
         assertPrints(Duration.ZERO.toIsoString(), "PT0S")
         assertPrints(Duration.INFINITE.toIsoString(), "PT9999999999999H")
     }
 
     @Sample
     fun toStringDefault() {
-        assertPrints(Duration.days(45), "45d")
+        assertPrints(45.days, "45d")
-        assertPrints(Duration.days(1.5), "1d 12h")
+        assertPrints(1.5.days, "1d 12h")
-        assertPrints(Duration.minutes(1230), "20h 30m")
+        assertPrints(1230.minutes, "20h 30m")
-        assertPrints(Duration.minutes(920), "15h 20m")
+        assertPrints(920.minutes, "15h 20m")
-        assertPrints(Duration.seconds(1.546), "1.546s")
+        assertPrints(1.546.seconds, "1.546s")
-        assertPrints(Duration.milliseconds(25.12), "25.12ms")
+        assertPrints(25.12.milliseconds, "25.12ms")
     }
 
     @Sample
     fun toStringDecimals() {
-        assertPrints(Duration.minutes(1230).toString(DurationUnit.DAYS, 2), "0.85d")
+        assertPrints(1230.minutes.toString(DurationUnit.DAYS, 2), "0.85d")
-        assertPrints(Duration.minutes(1230).toString(DurationUnit.HOURS, 2), "20.50h")
+        assertPrints(1230.minutes.toString(DurationUnit.HOURS, 2), "20.50h")
-        assertPrints(Duration.minutes(1230).toString(DurationUnit.MINUTES), "1230m")
+        assertPrints(1230.minutes.toString(DurationUnit.MINUTES), "1230m")
-        assertPrints(Duration.minutes(1230).toString(DurationUnit.SECONDS), "73800s")
+        assertPrints(1230.minutes.toString(DurationUnit.SECONDS), "73800s")
     }
 
     @Sample

libraries/stdlib/src/kotlin/time/Duration.kt

@@ -18,9 +18,9 @@ import kotlin.math.*
  * The type can store duration values up to ±146 years with nanosecond precision,
  * and up to ±146 million years with millisecond precision.
  *
- * To construct a duration, use either the extension function [toDuration] available on [Int], [Long], and [Double] numeric types,
+ * To construct a duration use either the extension function [toDuration],
- * or the `Duration` companion object functions [Duration.hours], [Duration.minutes], [Duration.seconds], and so on,
+ * or the extension properties [hours], [minutes], [seconds], and so on,
- * taking [Int], [Long], or [Double] numbers as parameters.
+ * available on [Int], [Long], and [Double] numeric types.
  *
  * To get the value of this duration expressed in a particular [duration units][DurationUnit]
  * use the functions [toInt], [toLong], and [toDouble]
@@ -59,12 +59,141 @@ public value class Duration internal constructor(private val rawValue: Long) : C
         public fun convert(value: Double, sourceUnit: DurationUnit, targetUnit: DurationUnit): Double =
             convertDurationUnit(value, sourceUnit, targetUnit)
 
+        // Duration construction extension properties in Duration companion scope
+
+        /** Returns a [Duration] equal to this [Int] number of nanoseconds. */
+        @kotlin.internal.InlineOnly
+        public inline val Int.nanoseconds get() = toDuration(DurationUnit.NANOSECONDS)
+
+        /** Returns a [Duration] equal to this [Long] number of nanoseconds. */
+        @kotlin.internal.InlineOnly
+        public inline val Long.nanoseconds get() = toDuration(DurationUnit.NANOSECONDS)
+
+        /**
+         * Returns a [Duration] equal to this [Double] number of nanoseconds.
+         *
+         * @throws IllegalArgumentException if this [Double] value is `NaN`.
+         */
+        @kotlin.internal.InlineOnly
+        public inline val Double.nanoseconds get() = toDuration(DurationUnit.NANOSECONDS)
+
+
+        /** Returns a [Duration] equal to this [Int] number of microseconds. */
+        @kotlin.internal.InlineOnly
+        public inline val Int.microseconds get() = toDuration(DurationUnit.MICROSECONDS)
+
+        /** Returns a [Duration] equal to this [Long] number of microseconds. */
+        @kotlin.internal.InlineOnly
+        public inline val Long.microseconds get() = toDuration(DurationUnit.MICROSECONDS)
+
+        /**
+         * Returns a [Duration] equal to this [Double] number of microseconds.
+         *
+         * @throws IllegalArgumentException if this [Double] value is `NaN`.
+         */
+        @kotlin.internal.InlineOnly
+        public inline val Double.microseconds get() = toDuration(DurationUnit.MICROSECONDS)
+
+
+        /** Returns a [Duration] equal to this [Int] number of milliseconds. */
+        @kotlin.internal.InlineOnly
+        public inline val Int.milliseconds get() = toDuration(DurationUnit.MILLISECONDS)
+
+        /** Returns a [Duration] equal to this [Long] number of milliseconds. */
+        @kotlin.internal.InlineOnly
+        public inline val Long.milliseconds get() = toDuration(DurationUnit.MILLISECONDS)
+
+        /**
+         * Returns a [Duration] equal to this [Double] number of milliseconds.
+         *
+         * @throws IllegalArgumentException if this [Double] value is `NaN`.
+         */
+        @kotlin.internal.InlineOnly
+        public inline val Double.milliseconds get() = toDuration(DurationUnit.MILLISECONDS)
+
+
+        /** Returns a [Duration] equal to this [Int] number of seconds. */
+        @kotlin.internal.InlineOnly
+        public inline val Int.seconds get() = toDuration(DurationUnit.SECONDS)
+
+        /** Returns a [Duration] equal to this [Long] number of seconds. */
+        @kotlin.internal.InlineOnly
+        public inline val Long.seconds get() = toDuration(DurationUnit.SECONDS)
+
+        /**
+         * Returns a [Duration] equal to this [Double] number of seconds.
+         *
+         * @throws IllegalArgumentException if this [Double] value is `NaN`.
+         */
+        @kotlin.internal.InlineOnly
+        public inline val Double.seconds get() = toDuration(DurationUnit.SECONDS)
+
+
+        /** Returns a [Duration] equal to this [Int] number of minutes. */
+        @kotlin.internal.InlineOnly
+        public inline val Int.minutes get() = toDuration(DurationUnit.MINUTES)
+
+        /** Returns a [Duration] equal to this [Long] number of minutes. */
+        @kotlin.internal.InlineOnly
+        public inline val Long.minutes get() = toDuration(DurationUnit.MINUTES)
+
+        /**
+         * Returns a [Duration] equal to this [Double] number of minutes.
+         *
+         * @throws IllegalArgumentException if this [Double] value is `NaN`.
+         */
+        @kotlin.internal.InlineOnly
+        public inline val Double.minutes get() = toDuration(DurationUnit.MINUTES)
+
+
+        /** Returns a [Duration] equal to this [Int] number of hours. */
+        @kotlin.internal.InlineOnly
+        public inline val Int.hours get() = toDuration(DurationUnit.HOURS)
+
+        /** Returns a [Duration] equal to this [Long] number of hours. */
+        @kotlin.internal.InlineOnly
+        public inline val Long.hours get() = toDuration(DurationUnit.HOURS)
+
+        /**
+         * Returns a [Duration] equal to this [Double] number of hours.
+         *
+         * @throws IllegalArgumentException if this [Double] value is `NaN`.
+         */
+        @kotlin.internal.InlineOnly
+        public inline val Double.hours get() = toDuration(DurationUnit.HOURS)
+
+
+        /** Returns a [Duration] equal to this [Int] number of days. */
+        @kotlin.internal.InlineOnly
+        public inline val Int.days get() = toDuration(DurationUnit.DAYS)
+
+        /** Returns a [Duration] equal to this [Long] number of days. */
+        @kotlin.internal.InlineOnly
+        public inline val Long.days get() = toDuration(DurationUnit.DAYS)
+
+        /**
+         * Returns a [Duration] equal to this [Double] number of days.
+         *
+         * @throws IllegalArgumentException if this [Double] value is `NaN`.
+         */
+        @kotlin.internal.InlineOnly
+        public inline val Double.days get() = toDuration(DurationUnit.DAYS)
+
+
+        // deprecated static factory functions
+
         /** Returns a [Duration] representing the specified [value] number of nanoseconds. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Int.nanoseconds' extension property from Duration.Companion instead.", ReplaceWith("value.nanoseconds", "kotlin.time.Duration.Companion.nanoseconds"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun nanoseconds(value: Int): Duration = value.toDuration(DurationUnit.NANOSECONDS)
 
         /** Returns a [Duration] representing the specified [value] number of nanoseconds. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Long.nanoseconds' extension property from Duration.Companion instead.", ReplaceWith("value.nanoseconds", "kotlin.time.Duration.Companion.nanoseconds"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun nanoseconds(value: Long): Duration = value.toDuration(DurationUnit.NANOSECONDS)
 
         /**
@@ -73,14 +202,24 @@ public value class Duration internal constructor(private val rawValue: Long) : C
          * @throws IllegalArgumentException if the provided `Double` [value] is `NaN`.
          */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Double.nanoseconds' extension property from Duration.Companion instead.", ReplaceWith("value.nanoseconds", "kotlin.time.Duration.Companion.nanoseconds"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun nanoseconds(value: Double): Duration = value.toDuration(DurationUnit.NANOSECONDS)
 
+
         /** Returns a [Duration] representing the specified [value] number of microseconds. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Int.microseconds' extension property from Duration.Companion instead.", ReplaceWith("value.microseconds", "kotlin.time.Duration.Companion.microseconds"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun microseconds(value: Int): Duration = value.toDuration(DurationUnit.MICROSECONDS)
 
         /** Returns a [Duration] representing the specified [value] number of microseconds. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Long.microseconds' extension property from Duration.Companion instead.", ReplaceWith("value.microseconds", "kotlin.time.Duration.Companion.microseconds"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun microseconds(value: Long): Duration = value.toDuration(DurationUnit.MICROSECONDS)
 
         /**
@@ -89,14 +228,24 @@ public value class Duration internal constructor(private val rawValue: Long) : C
          * @throws IllegalArgumentException if the provided `Double` [value] is `NaN`.
          */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Double.microseconds' extension property from Duration.Companion instead.", ReplaceWith("value.microseconds", "kotlin.time.Duration.Companion.microseconds"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun microseconds(value: Double): Duration = value.toDuration(DurationUnit.MICROSECONDS)
 
+
         /** Returns a [Duration] representing the specified [value] number of milliseconds. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Int.milliseconds' extension property from Duration.Companion instead.", ReplaceWith("value.milliseconds", "kotlin.time.Duration.Companion.milliseconds"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun milliseconds(value: Int): Duration = value.toDuration(DurationUnit.MILLISECONDS)
 
         /** Returns a [Duration] representing the specified [value] number of milliseconds. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Long.milliseconds' extension property from Duration.Companion instead.", ReplaceWith("value.milliseconds", "kotlin.time.Duration.Companion.milliseconds"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun milliseconds(value: Long): Duration = value.toDuration(DurationUnit.MILLISECONDS)
 
         /**
@@ -105,14 +254,24 @@ public value class Duration internal constructor(private val rawValue: Long) : C
          * @throws IllegalArgumentException if the provided `Double` [value] is `NaN`.
          */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Double.milliseconds' extension property from Duration.Companion instead.", ReplaceWith("value.milliseconds", "kotlin.time.Duration.Companion.milliseconds"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun milliseconds(value: Double): Duration = value.toDuration(DurationUnit.MILLISECONDS)
 
+
         /** Returns a [Duration] representing the specified [value] number of seconds. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Int.seconds' extension property from Duration.Companion instead.", ReplaceWith("value.seconds", "kotlin.time.Duration.Companion.seconds"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun seconds(value: Int): Duration = value.toDuration(DurationUnit.SECONDS)
 
         /** Returns a [Duration] representing the specified [value] number of seconds. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Long.seconds' extension property from Duration.Companion instead.", ReplaceWith("value.seconds", "kotlin.time.Duration.Companion.seconds"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun seconds(value: Long): Duration = value.toDuration(DurationUnit.SECONDS)
 
         /**
@@ -121,14 +280,24 @@ public value class Duration internal constructor(private val rawValue: Long) : C
          * @throws IllegalArgumentException if the provided `Double` [value] is `NaN`.
          */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Double.seconds' extension property from Duration.Companion instead.", ReplaceWith("value.seconds", "kotlin.time.Duration.Companion.seconds"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun seconds(value: Double): Duration = value.toDuration(DurationUnit.SECONDS)
 
+
         /** Returns a [Duration] representing the specified [value] number of minutes. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Int.minutes' extension property from Duration.Companion instead.", ReplaceWith("value.minutes", "kotlin.time.Duration.Companion.minutes"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun minutes(value: Int): Duration = value.toDuration(DurationUnit.MINUTES)
 
         /** Returns a [Duration] representing the specified [value] number of minutes. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Long.minutes' extension property from Duration.Companion instead.", ReplaceWith("value.minutes", "kotlin.time.Duration.Companion.minutes"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun minutes(value: Long): Duration = value.toDuration(DurationUnit.MINUTES)
 
         /**
@@ -137,14 +306,24 @@ public value class Duration internal constructor(private val rawValue: Long) : C
          * @throws IllegalArgumentException if the provided `Double` [value] is `NaN`.
          */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Double.minutes' extension property from Duration.Companion instead.", ReplaceWith("value.minutes", "kotlin.time.Duration.Companion.minutes"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun minutes(value: Double): Duration = value.toDuration(DurationUnit.MINUTES)
 
+
         /** Returns a [Duration] representing the specified [value] number of hours. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Int.hours' extension property from Duration.Companion instead.", ReplaceWith("value.hours", "kotlin.time.Duration.Companion.hours"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun hours(value: Int): Duration = value.toDuration(DurationUnit.HOURS)
 
         /** Returns a [Duration] representing the specified [value] number of hours. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Long.hours' extension property from Duration.Companion instead.", ReplaceWith("value.hours", "kotlin.time.Duration.Companion.hours"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun hours(value: Long): Duration = value.toDuration(DurationUnit.HOURS)
 
         /**
@@ -153,14 +332,24 @@ public value class Duration internal constructor(private val rawValue: Long) : C
          * @throws IllegalArgumentException if the provided `Double` [value] is `NaN`.
          */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Double.hours' extension property from Duration.Companion instead.", ReplaceWith("value.hours", "kotlin.time.Duration.Companion.hours"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun hours(value: Double): Duration = value.toDuration(DurationUnit.HOURS)
 
+
         /** Returns a [Duration] representing the specified [value] number of days. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Int.days' extension property from Duration.Companion instead.", ReplaceWith("value.days", "kotlin.time.Duration.Companion.days"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun days(value: Int): Duration = value.toDuration(DurationUnit.DAYS)
 
         /** Returns a [Duration] representing the specified [value] number of days. */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Long.days' extension property from Duration.Companion instead.", ReplaceWith("value.days", "kotlin.time.Duration.Companion.days"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun days(value: Long): Duration = value.toDuration(DurationUnit.DAYS)
 
         /**
@@ -169,6 +358,9 @@ public value class Duration internal constructor(private val rawValue: Long) : C
          * @throws IllegalArgumentException if the provided `Double` [value] is `NaN`.
          */
         @SinceKotlin("1.5")
+        @ExperimentalTime
+        @Deprecated("Use 'Double.days' extension property from Duration.Companion instead.", ReplaceWith("value.days", "kotlin.time.Duration.Companion.days"))
+        @DeprecatedSinceKotlin(warningSince = "1.6")
         public fun days(value: Double): Duration = value.toDuration(DurationUnit.DAYS)
 
         /**
@@ -882,160 +1074,187 @@ public fun Double.toDuration(unit: DurationUnit): Duration {
 }
 
 // constructing from number of units
-// extension properties
+// deprecated extension properties
 
 /** Returns a [Duration] equal to this [Int] number of nanoseconds. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.nanoseconds() function instead.", ReplaceWith("Duration.nanoseconds(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Int.nanoseconds' extension property from Duration.Companion instead.", ReplaceWith("this.nanoseconds", "kotlin.time.Duration.Companion.nanoseconds"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Int.nanoseconds get() = toDuration(DurationUnit.NANOSECONDS)
 
 /** Returns a [Duration] equal to this [Long] number of nanoseconds. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.nanoseconds() function instead.", ReplaceWith("Duration.nanoseconds(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Long.nanoseconds' extension property from Duration.Companion instead.", ReplaceWith("this.nanoseconds", "kotlin.time.Duration.Companion.nanoseconds"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Long.nanoseconds get() = toDuration(DurationUnit.NANOSECONDS)
 
 /**
  * Returns a [Duration] equal to this [Double] number of nanoseconds.
  *
- * @throws IllegalArgumentException if this `Double` value is `NaN`.
+ * @throws IllegalArgumentException if this [Double] value is `NaN`.
  */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.nanoseconds() function instead.", ReplaceWith("Duration.nanoseconds(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Double.nanoseconds' extension property from Duration.Companion instead.", ReplaceWith("this.nanoseconds", "kotlin.time.Duration.Companion.nanoseconds"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Double.nanoseconds get() = toDuration(DurationUnit.NANOSECONDS)
 
+
 /** Returns a [Duration] equal to this [Int] number of microseconds. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.microseconds() function instead.", ReplaceWith("Duration.microseconds(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Int.microseconds' extension property from Duration.Companion instead.", ReplaceWith("this.microseconds", "kotlin.time.Duration.Companion.microseconds"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Int.microseconds get() = toDuration(DurationUnit.MICROSECONDS)
 
 /** Returns a [Duration] equal to this [Long] number of microseconds. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.microseconds() function instead.", ReplaceWith("Duration.microseconds(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Long.microseconds' extension property from Duration.Companion instead.", ReplaceWith("this.microseconds", "kotlin.time.Duration.Companion.microseconds"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Long.microseconds get() = toDuration(DurationUnit.MICROSECONDS)
 
 /**
  * Returns a [Duration] equal to this [Double] number of microseconds.
  *
- * @throws IllegalArgumentException if this `Double` value is `NaN`.
+ * @throws IllegalArgumentException if this [Double] value is `NaN`.
  */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.microseconds() function instead.", ReplaceWith("Duration.microseconds(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Double.microseconds' extension property from Duration.Companion instead.", ReplaceWith("this.microseconds", "kotlin.time.Duration.Companion.microseconds"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Double.microseconds get() = toDuration(DurationUnit.MICROSECONDS)
 
+
 /** Returns a [Duration] equal to this [Int] number of milliseconds. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.milliseconds() function instead.", ReplaceWith("Duration.milliseconds(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Int.milliseconds' extension property from Duration.Companion instead.", ReplaceWith("this.milliseconds", "kotlin.time.Duration.Companion.milliseconds"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Int.milliseconds get() = toDuration(DurationUnit.MILLISECONDS)
 
 /** Returns a [Duration] equal to this [Long] number of milliseconds. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.milliseconds() function instead.", ReplaceWith("Duration.milliseconds(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Long.milliseconds' extension property from Duration.Companion instead.", ReplaceWith("this.milliseconds", "kotlin.time.Duration.Companion.milliseconds"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Long.milliseconds get() = toDuration(DurationUnit.MILLISECONDS)
 
 /**
  * Returns a [Duration] equal to this [Double] number of milliseconds.
  *
- * @throws IllegalArgumentException if this `Double` value is `NaN`.
+ * @throws IllegalArgumentException if this [Double] value is `NaN`.
  */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.milliseconds() function instead.", ReplaceWith("Duration.milliseconds(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Double.milliseconds' extension property from Duration.Companion instead.", ReplaceWith("this.milliseconds", "kotlin.time.Duration.Companion.milliseconds"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Double.milliseconds get() = toDuration(DurationUnit.MILLISECONDS)
 
+
 /** Returns a [Duration] equal to this [Int] number of seconds. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.seconds() function instead.", ReplaceWith("Duration.seconds(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Int.seconds' extension property from Duration.Companion instead.", ReplaceWith("this.seconds", "kotlin.time.Duration.Companion.seconds"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Int.seconds get() = toDuration(DurationUnit.SECONDS)
 
 /** Returns a [Duration] equal to this [Long] number of seconds. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.seconds() function instead.", ReplaceWith("Duration.seconds(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Long.seconds' extension property from Duration.Companion instead.", ReplaceWith("this.seconds", "kotlin.time.Duration.Companion.seconds"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Long.seconds get() = toDuration(DurationUnit.SECONDS)
 
 /**
  * Returns a [Duration] equal to this [Double] number of seconds.
  *
- * @throws IllegalArgumentException if this `Double` value is `NaN`.
+ * @throws IllegalArgumentException if this [Double] value is `NaN`.
  */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.seconds() function instead.", ReplaceWith("Duration.seconds(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Double.seconds' extension property from Duration.Companion instead.", ReplaceWith("this.seconds", "kotlin.time.Duration.Companion.seconds"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Double.seconds get() = toDuration(DurationUnit.SECONDS)
 
+
 /** Returns a [Duration] equal to this [Int] number of minutes. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.minutes() function instead.", ReplaceWith("Duration.minutes(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Int.minutes' extension property from Duration.Companion instead.", ReplaceWith("this.minutes", "kotlin.time.Duration.Companion.minutes"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Int.minutes get() = toDuration(DurationUnit.MINUTES)
 
 /** Returns a [Duration] equal to this [Long] number of minutes. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.minutes() function instead.", ReplaceWith("Duration.minutes(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Long.minutes' extension property from Duration.Companion instead.", ReplaceWith("this.minutes", "kotlin.time.Duration.Companion.minutes"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Long.minutes get() = toDuration(DurationUnit.MINUTES)
 
 /**
  * Returns a [Duration] equal to this [Double] number of minutes.
  *
- * @throws IllegalArgumentException if this `Double` value is `NaN`.
+ * @throws IllegalArgumentException if this [Double] value is `NaN`.
  */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.minutes() function instead.", ReplaceWith("Duration.minutes(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Double.minutes' extension property from Duration.Companion instead.", ReplaceWith("this.minutes", "kotlin.time.Duration.Companion.minutes"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Double.minutes get() = toDuration(DurationUnit.MINUTES)
 
+
 /** Returns a [Duration] equal to this [Int] number of hours. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.hours() function instead.", ReplaceWith("Duration.hours(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Int.hours' extension property from Duration.Companion instead.", ReplaceWith("this.hours", "kotlin.time.Duration.Companion.hours"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Int.hours get() = toDuration(DurationUnit.HOURS)
 
 /** Returns a [Duration] equal to this [Long] number of hours. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.hours() function instead.", ReplaceWith("Duration.hours(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Long.hours' extension property from Duration.Companion instead.", ReplaceWith("this.hours", "kotlin.time.Duration.Companion.hours"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Long.hours get() = toDuration(DurationUnit.HOURS)
 
 /**
  * Returns a [Duration] equal to this [Double] number of hours.
  *
- * @throws IllegalArgumentException if this `Double` value is `NaN`.
+ * @throws IllegalArgumentException if this [Double] value is `NaN`.
  */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.hours() function instead.", ReplaceWith("Duration.hours(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Double.hours' extension property from Duration.Companion instead.", ReplaceWith("this.hours", "kotlin.time.Duration.Companion.hours"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Double.hours get() = toDuration(DurationUnit.HOURS)
 
+
 /** Returns a [Duration] equal to this [Int] number of days. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.days() function instead.", ReplaceWith("Duration.days(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Int.days' extension property from Duration.Companion instead.", ReplaceWith("this.days", "kotlin.time.Duration.Companion.days"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Int.days get() = toDuration(DurationUnit.DAYS)
 
 /** Returns a [Duration] equal to this [Long] number of days. */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.days() function instead.", ReplaceWith("Duration.days(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Long.days' extension property from Duration.Companion instead.", ReplaceWith("this.days", "kotlin.time.Duration.Companion.days"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Long.days get() = toDuration(DurationUnit.DAYS)
 
 /**
  * Returns a [Duration] equal to this [Double] number of days.
  *
- * @throws IllegalArgumentException if this `Double` value is `NaN`.
+ * @throws IllegalArgumentException if this [Double] value is `NaN`.
  */
 @SinceKotlin("1.3")
 @ExperimentalTime
-@Deprecated("Use Duration.days() function instead.", ReplaceWith("Duration.days(this)", "kotlin.time.Duration"))
+@Deprecated("Use 'Double.days' extension property from Duration.Companion instead.", ReplaceWith("this.days", "kotlin.time.Duration.Companion.days"))
+@DeprecatedSinceKotlin(warningSince = "1.5", errorSince = "1.6")
 public val Double.days get() = toDuration(DurationUnit.DAYS)
 
 

libraries/stdlib/test/time/DurationTest.kt

@@ -13,6 +13,13 @@ import kotlin.native.concurrent.SharedImmutable
 import kotlin.test.*
 import kotlin.time.*
 import kotlin.random.*
+import kotlin.time.Duration.Companion.days
+import kotlin.time.Duration.Companion.hours
+import kotlin.time.Duration.Companion.microseconds
+import kotlin.time.Duration.Companion.milliseconds
+import kotlin.time.Duration.Companion.minutes
+import kotlin.time.Duration.Companion.nanoseconds
+import kotlin.time.Duration.Companion.seconds
 
 @SharedImmutable
 private val units = DurationUnit.values()
@@ -47,8 +54,8 @@ class DurationTest {
             val borderValue = convertDurationUnit(MAX_NANOS, DurationUnit.NANOSECONDS, unit)
             val d1 = borderValue.toDuration(unit)
             val d2 = (borderValue + 1).toDuration(unit)
-            assertNotEquals(d1, d1 + Duration.nanoseconds(1))
+            assertNotEquals(d1, d1 + 1.nanoseconds)
-            assertEquals(d2, d2 + Duration.nanoseconds(1))
+            assertEquals(d2, d2 + 1.nanoseconds)
         }
 
         assertEquals(Long.MAX_VALUE / 1000, Long.MAX_VALUE.toDuration(DurationUnit.MICROSECONDS).inWholeMilliseconds)
@@ -96,8 +103,8 @@ class DurationTest {
         }
 
         run { // invariant Duration.nanoseconds(d.inWholeNanoseconds) == d when whole nanoseconds fits into Long range
-            val d1 = Duration.nanoseconds(MAX_NANOS + 1)
+            val d1 = (MAX_NANOS + 1).nanoseconds
-            val d2 = Duration.nanoseconds(d1.inWholeNanoseconds)
+            val d2 = d1.inWholeNanoseconds.nanoseconds
             assertEquals(d1.inWholeNanoseconds, d2.inWholeNanoseconds)
             assertEquals(d1, d2)
         }
@@ -115,10 +122,10 @@ class DurationTest {
             )
         }
 
-        val d4 = Duration.nanoseconds(Long.MAX_VALUE)
+        val d4 = Long.MAX_VALUE.nanoseconds
-        val d3 = Duration.nanoseconds(MAX_NANOS + 1)
+        val d3 = (MAX_NANOS + 1).nanoseconds
-        val d2 = Duration.nanoseconds(MAX_NANOS)
+        val d2 = MAX_NANOS.nanoseconds
-        val d1 = Duration.nanoseconds(MAX_NANOS - 1)
+        val d1 = (MAX_NANOS - 1).nanoseconds
 
         assertGreater(d4, d2, "same sign, different ranges")
         assertGreater(d3, d2, "same sign, different ranges 2")
@@ -136,57 +143,57 @@ class DurationTest {
         val n2 = Random.nextLong(Long.MAX_VALUE)
         val n3 = Random.nextDouble()
 
-        assertEquals(n1.toDuration(DurationUnit.DAYS), Duration.days(n1))
+        assertEquals(n1.toDuration(DurationUnit.DAYS), n1.days)
-        assertEquals(n2.toDuration(DurationUnit.DAYS), Duration.days(n2))
+        assertEquals(n2.toDuration(DurationUnit.DAYS), n2.days)
-        assertEquals(n3.toDuration(DurationUnit.DAYS), Duration.days(n3))
+        assertEquals(n3.toDuration(DurationUnit.DAYS), n3.days)
 
-        assertEquals(n1.toDuration(DurationUnit.HOURS), Duration.hours(n1))
+        assertEquals(n1.toDuration(DurationUnit.HOURS), n1.hours)
-        assertEquals(n2.toDuration(DurationUnit.HOURS), Duration.hours(n2))
+        assertEquals(n2.toDuration(DurationUnit.HOURS), n2.hours)
-        assertEquals(n3.toDuration(DurationUnit.HOURS), Duration.hours(n3))
+        assertEquals(n3.toDuration(DurationUnit.HOURS), n3.hours)
 
-        assertEquals(n1.toDuration(DurationUnit.MINUTES), Duration.minutes(n1))
+        assertEquals(n1.toDuration(DurationUnit.MINUTES), n1.minutes)
-        assertEquals(n2.toDuration(DurationUnit.MINUTES), Duration.minutes(n2))
+        assertEquals(n2.toDuration(DurationUnit.MINUTES), n2.minutes)
-        assertEquals(n3.toDuration(DurationUnit.MINUTES), Duration.minutes(n3))
+        assertEquals(n3.toDuration(DurationUnit.MINUTES), n3.minutes)
 
-        assertEquals(n1.toDuration(DurationUnit.SECONDS), Duration.seconds(n1))
+        assertEquals(n1.toDuration(DurationUnit.SECONDS), n1.seconds)
-        assertEquals(n2.toDuration(DurationUnit.SECONDS), Duration.seconds(n2))
+        assertEquals(n2.toDuration(DurationUnit.SECONDS), n2.seconds)
-        assertEquals(n3.toDuration(DurationUnit.SECONDS), Duration.seconds(n3))
+        assertEquals(n3.toDuration(DurationUnit.SECONDS), n3.seconds)
 
-        assertEquals(n1.toDuration(DurationUnit.MILLISECONDS), Duration.milliseconds(n1))
+        assertEquals(n1.toDuration(DurationUnit.MILLISECONDS), n1.milliseconds)
-        assertEquals(n2.toDuration(DurationUnit.MILLISECONDS), Duration.milliseconds(n2))
+        assertEquals(n2.toDuration(DurationUnit.MILLISECONDS), n2.milliseconds)
-        assertEquals(n3.toDuration(DurationUnit.MILLISECONDS), Duration.milliseconds(n3))
+        assertEquals(n3.toDuration(DurationUnit.MILLISECONDS), n3.milliseconds)
 
-        assertEquals(n1.toDuration(DurationUnit.MICROSECONDS), Duration.microseconds(n1))
+        assertEquals(n1.toDuration(DurationUnit.MICROSECONDS), n1.microseconds)
-        assertEquals(n2.toDuration(DurationUnit.MICROSECONDS), Duration.microseconds(n2))
+        assertEquals(n2.toDuration(DurationUnit.MICROSECONDS), n2.microseconds)
-        assertEquals(n3.toDuration(DurationUnit.MICROSECONDS), Duration.microseconds(n3))
+        assertEquals(n3.toDuration(DurationUnit.MICROSECONDS), n3.microseconds)
 
-        assertEquals(n1.toDuration(DurationUnit.NANOSECONDS), Duration.nanoseconds(n1))
+        assertEquals(n1.toDuration(DurationUnit.NANOSECONDS), n1.nanoseconds)
-        assertEquals(n2.toDuration(DurationUnit.NANOSECONDS), Duration.nanoseconds(n2))
+        assertEquals(n2.toDuration(DurationUnit.NANOSECONDS), n2.nanoseconds)
-        assertEquals(n3.toDuration(DurationUnit.NANOSECONDS), Duration.nanoseconds(n3))
+        assertEquals(n3.toDuration(DurationUnit.NANOSECONDS), n3.nanoseconds)
     }
 
     @Test
     fun conversionToNumber() {
-        assertEquals(24, Duration.days(1).inWholeHours)
+        assertEquals(24, 1.days.inWholeHours)
-        assertEquals(0.5, Duration.hours(12).toDouble(DurationUnit.DAYS))
+        assertEquals(0.5, 12.hours.toDouble(DurationUnit.DAYS))
-        assertEquals(0, Duration.hours(12).inWholeDays)
+        assertEquals(0, 12.hours.inWholeDays)
-        assertEquals(15, Duration.hours(0.25).inWholeMinutes)
+        assertEquals(15, 0.25.hours.inWholeMinutes)
-        assertEquals(600, Duration.minutes(10).inWholeSeconds)
+        assertEquals(600, 10.minutes.inWholeSeconds)
-        assertEquals(500, Duration.seconds(0.5).inWholeMilliseconds)
+        assertEquals(500, 0.5.seconds.inWholeMilliseconds)
-        assertEquals(50_000, Duration.seconds(0.05).inWholeMicroseconds)
+        assertEquals(50_000, 0.05.seconds.inWholeMicroseconds)
-        assertEquals(50_000, Duration.milliseconds(0.05).inWholeNanoseconds)
+        assertEquals(50_000, 0.05.milliseconds.inWholeNanoseconds)
 
-        assertEquals(365 * 86400 * 1_000_000_000L, Duration.days(365).inWholeNanoseconds)
+        assertEquals(365 * 86400 * 1_000_000_000L, 365.days.inWholeNanoseconds)
 
         assertEquals(0, Duration.ZERO.inWholeNanoseconds)
         assertEquals(0, Duration.ZERO.inWholeMicroseconds)
         assertEquals(0, Duration.ZERO.inWholeMilliseconds)
 
-        assertEquals(10500, Duration.seconds(10.5).inWholeMilliseconds)
+        assertEquals(10500, 10.5.seconds.inWholeMilliseconds)
-        assertEquals(11, Duration.milliseconds(11.5).inWholeMilliseconds)
+        assertEquals(11, 11.5.milliseconds.inWholeMilliseconds)
-        assertEquals(-11, Duration.milliseconds((-11.5)).inWholeMilliseconds)
+        assertEquals(-11, (-11.5).milliseconds.inWholeMilliseconds)
-        assertEquals(252_000_000, Duration.milliseconds(252).inWholeNanoseconds)
+        assertEquals(252_000_000, 252.milliseconds.inWholeNanoseconds)
-        assertEquals(Long.MAX_VALUE, (Duration.days(365) * 293).inWholeNanoseconds) // clamping overflowed value
+        assertEquals(Long.MAX_VALUE, (365.days * 293).inWholeNanoseconds) // clamping overflowed value
 
         repeat(100) {
             val value = Random.nextLong(1000)
@@ -219,7 +226,7 @@ class DurationTest {
             val s = Random.nextInt(60)
             val ns = Random.nextInt(1e9.toInt())
             val expectedNs = if (isNsRange) ns else ns - (ns % NANOS_IN_MILLIS)
-            (Duration.days(d) + Duration.hours(h) + Duration.minutes(m) + Duration.seconds(s) + Duration.nanoseconds(ns)).run {
+            (d.days + h.hours + m.minutes + s.seconds + ns.nanoseconds).run {
                 toComponents { seconds, nanoseconds ->
                     assertEquals(d * 86400 + h * 3600 + m * 60 + s, seconds)
                     assertEquals(expectedNs, nanoseconds)
@@ -248,7 +255,7 @@ class DurationTest {
 
     @Test
     fun componentsOfCarriedSum() {
-        (Duration.hours(36) + Duration.minutes(90) + Duration.seconds(90) + Duration.milliseconds(1500)).run {
+        (36.hours + 90.minutes + 90.seconds + 1500.milliseconds).run {
             toComponents { days, hours, minutes, seconds, nanoseconds ->
                 assertEquals(1, days)
                 assertEquals(13, hours)
@@ -292,11 +299,11 @@ class DurationTest {
     fun infinite() {
         assertTrue(Duration.INFINITE.isInfinite())
         assertTrue((-Duration.INFINITE).isInfinite())
-        assertTrue(Duration.nanoseconds(Double.POSITIVE_INFINITY).isInfinite())
+        assertTrue(Double.POSITIVE_INFINITY.nanoseconds.isInfinite())
 
         // seconds converted to nanoseconds overflow to infinite
-        assertTrue(Duration.seconds(Double.MAX_VALUE).isInfinite())
+        assertTrue(Double.MAX_VALUE.seconds.isInfinite())
-        assertTrue(Duration.seconds((-Double.MAX_VALUE)).isInfinite())
+        assertTrue((-Double.MAX_VALUE).seconds.isInfinite())
     }
 
 
@@ -312,8 +319,8 @@ class DurationTest {
 
     @Test
     fun signAndAbsoluteValue() {
-        val negative = -Duration.seconds(1)
+        val negative = -1.seconds
-        val positive = Duration.seconds(1)
+        val positive = 1.seconds
         val zero = Duration.ZERO
 
         assertTrue(negative.isNegative())
@@ -344,23 +351,23 @@ class DurationTest {
             assertEquals(0, Duration.ZERO.compareTo(value))
             assertEquals(0, Duration.ZERO.toDouble(DurationUnit.NANOSECONDS).compareTo(value.toDouble(DurationUnit.NANOSECONDS)))
         }
-        equivalentToZero(Duration.seconds(-0.0))
+        equivalentToZero((-0.0).seconds)
         equivalentToZero((-0.0).toDuration(DurationUnit.DAYS))
         equivalentToZero(-Duration.ZERO)
-        equivalentToZero(Duration.seconds(-1) / Double.POSITIVE_INFINITY)
+        equivalentToZero((-1).seconds / Double.POSITIVE_INFINITY)
-        equivalentToZero(Duration.seconds(0) / -1)
+        equivalentToZero(0.seconds / -1)
-        equivalentToZero(Duration.seconds(-1) * 0.0)
+        equivalentToZero((-1).seconds * 0.0)
-        equivalentToZero(Duration.seconds(0) * -1)
+        equivalentToZero(0.seconds * -1)
     }
 
 
     @Test
     fun addition() {
-        assertEquals(Duration.hours(1.5), Duration.hours(1) + Duration.minutes(30))
+        assertEquals(1.5.hours, 1.hours + 30.minutes)
-        assertEquals(Duration.days(0.5), Duration.hours(6) + Duration.minutes(360))
+        assertEquals(0.5.days, 6.hours + 360.minutes)
-        assertEquals(Duration.seconds(0.5), Duration.milliseconds(200) + Duration.microseconds(300_000))
+        assertEquals(0.5.seconds, 200.milliseconds + 300_000.microseconds)
 
-        for (value in listOf(Duration.ZERO, Duration.nanoseconds(1), Duration.days(500 * 365))) {
+        for (value in listOf(Duration.ZERO, 1.nanoseconds, (500 * 365).days)) {
             for (inf in listOf(Duration.INFINITE, -Duration.INFINITE)) {
                 for (result in listOf(inf + inf, inf + value, inf + (-value), value + inf, (-value) + inf)) {
                     assertEquals(inf, result)
@@ -373,35 +380,35 @@ class DurationTest {
 
     @Test
     fun subtraction() {
-        assertEquals(Duration.hours(10), Duration.days(0.5) - Duration.minutes(120))
+        assertEquals(10.hours, 0.5.days - 120.minutes)
-        assertEquals(Duration.milliseconds(850), Duration.seconds(1) - Duration.milliseconds(150))
+        assertEquals(850.milliseconds, 1.seconds - 150.milliseconds)
-        assertEquals(Duration.milliseconds(1150), Duration.seconds(1) - Duration.milliseconds(-150))
+        assertEquals(1150.milliseconds, 1.seconds - (-150).milliseconds)
-        assertEquals(Duration.milliseconds(1), Duration.microseconds(Long.MAX_VALUE) - Duration.microseconds(Long.MAX_VALUE - 1_000))
+        assertEquals(1.milliseconds, Long.MAX_VALUE.microseconds - (Long.MAX_VALUE - 1_000).microseconds)
-        assertEquals(Duration.milliseconds(-1), Duration.microseconds(Long.MAX_VALUE - 1_000) - Duration.microseconds(Long.MAX_VALUE))
+        assertEquals((-1).milliseconds, (Long.MAX_VALUE - 1_000).microseconds - Long.MAX_VALUE.microseconds)
 
         run {
             val offset = 2L * NANOS_IN_MILLIS
             val value = MAX_NANOS + offset
-            val base = Duration.nanoseconds(value)
+            val base = value.nanoseconds
             val baseNs = base.inWholeMilliseconds * NANOS_IN_MILLIS
             assertEquals(baseNs, base.inWholeNanoseconds)  // base stored as millis
 
             val smallDeltas = listOf(1L, 2L, 1000L, NANOS_IN_MILLIS - 1L) + List(10) { Random.nextLong(NANOS_IN_MILLIS.toLong()) }
             for (smallDeltaNs in smallDeltas) {
-                assertEquals(base, base - Duration.nanoseconds(smallDeltaNs), "delta: $smallDeltaNs")
+                assertEquals(base, base - smallDeltaNs.nanoseconds, "delta: $smallDeltaNs")
             }
 
             val deltas = listOf(offset + 1L, offset + 1500L) +
                     List(10) { Random.nextLong(offset + 1500, offset + 10000) } +
                     List(100) { Random.nextLong(offset + 1500, MAX_NANOS) }
             for (deltaNs in deltas) {
-                val delta = Duration.nanoseconds(deltaNs)
+                val delta = deltaNs.nanoseconds
                 assertEquals(deltaNs, delta.inWholeNanoseconds)
                 assertEquals(baseNs - deltaNs, (base - delta).inWholeNanoseconds, "base: $baseNs, delta: $deltaNs")
             }
         }
 
-        for (value in listOf(Duration.ZERO, Duration.nanoseconds(1), Duration.days(500 * 365))) {
+        for (value in listOf(Duration.ZERO, 1.nanoseconds, (500 * 365).days)) {
             for (inf in listOf(Duration.INFINITE, -Duration.INFINITE)) {
                 for (result in listOf(inf - (-inf), inf - value, inf - (-value), value - (-inf), (-value) - (-inf))) {
                     assertEquals(inf, result)
@@ -414,31 +421,31 @@ class DurationTest {
 
     @Test
     fun multiplication() {
-        assertEquals(Duration.days(1), Duration.hours(12) * 2)
+        assertEquals(1.days, 12.hours * 2)
-        assertEquals(Duration.days(1), Duration.minutes(60) * 24.0)
+        assertEquals(1.days, 60.minutes * 24.0)
-        assertEquals(Duration.microseconds(1), Duration.nanoseconds(20) * 50)
+        assertEquals(1.microseconds, 20.nanoseconds * 50)
 
-        assertEquals(Duration.days(1), 2 * Duration.hours(12))
+        assertEquals(1.days, 2 * 12.hours)
-        assertEquals(Duration.hours(12.5), 12.5 * Duration.minutes(60))
+        assertEquals(12.5.hours, 12.5 * 60.minutes)
-        assertEquals(Duration.microseconds(1), 50 * Duration.nanoseconds(20))
+        assertEquals(1.microseconds, 50 * 20.nanoseconds)
 
-        assertEquals(Duration.ZERO, 0 * Duration.hours(1))
+        assertEquals(Duration.ZERO, 0 * 1.hours)
-        assertEquals(Duration.ZERO, Duration.seconds(1) * 0.0)
+        assertEquals(Duration.ZERO, 1.seconds * 0.0)
 
         run { // promoting nanos range to millis range after multiplication
             val value = MAX_NANOS
-            assertEquals(value, (Duration.nanoseconds(value) * 1_000_000).inWholeMilliseconds)
+            assertEquals(value, (value.nanoseconds * 1_000_000).inWholeMilliseconds)
-            assertEquals(value / 1000, (Duration.nanoseconds(value) * 1_000).inWholeMilliseconds)
+            assertEquals(value / 1000, (value.nanoseconds * 1_000).inWholeMilliseconds)
-            assertEquals(Duration.INFINITE, Duration.nanoseconds(Long.MAX_VALUE / 1000 + 1) * 1_000_000_000)
+            assertEquals(Duration.INFINITE, (Long.MAX_VALUE / 1000 + 1).nanoseconds * 1_000_000_000)
         }
 
         run {
             val value = MAX_NANOS / Int.MAX_VALUE
-            assertTrue((Duration.nanoseconds(value) * Int.MIN_VALUE).inWholeNanoseconds < -MAX_NANOS)
+            assertTrue((value.nanoseconds * Int.MIN_VALUE).inWholeNanoseconds < -MAX_NANOS)
         }
 
-        assertEquals(Duration.INFINITE, Duration.days(Int.MAX_VALUE) * Int.MAX_VALUE)
+        assertEquals(Duration.INFINITE, Int.MAX_VALUE.days * Int.MAX_VALUE)
-        assertEquals(-Duration.INFINITE, Duration.days(Int.MAX_VALUE) * Int.MIN_VALUE)
+        assertEquals(-Duration.INFINITE, Int.MAX_VALUE.days * Int.MIN_VALUE)
 
         assertEquals(Duration.INFINITE, Duration.INFINITE * Double.POSITIVE_INFINITY)
         assertEquals(Duration.INFINITE, Duration.INFINITE * Double.MIN_VALUE)
@@ -451,20 +458,20 @@ class DurationTest {
 
     @Test
     fun divisionByNumber() {
-        assertEquals(Duration.hours(12), Duration.days(1) / 2)
+        assertEquals(12.hours, 1.days / 2)
-        assertEquals(Duration.minutes(60), Duration.days(1) / 24.0)
+        assertEquals(60.minutes, 1.days / 24.0)
-        assertEquals(Duration.seconds(20), Duration.minutes(2) / 6)
+        assertEquals(20.seconds, 2.minutes / 6)
-        assertEquals(Duration.days(365), Duration.days(365 * 299) / 299)
+        assertEquals(365.days, (365 * 299).days / 299)
-        assertEquals(Duration.days(365), Duration.days(365 * 299.5) / 299.5)
+        assertEquals(365.days, (365 * 299.5).days / 299.5)
 
         run {
             val value = MAX_NANOS
-            assertEquals(value, (Duration.milliseconds(value) / 1_000_000).inWholeNanoseconds)
+            assertEquals(value, (value.milliseconds / 1_000_000).inWholeNanoseconds)
         }
 
-        assertEquals(Duration.INFINITE, Duration.seconds(1) / 0)
+        assertEquals(Duration.INFINITE, 1.seconds / 0)
-        assertEquals(-Duration.INFINITE, -Duration.seconds(1) / 0.0)
+        assertEquals(-Duration.INFINITE, -1.seconds / 0.0)
-        assertEquals(Duration.INFINITE, -Duration.seconds(1) / (-0.0))
+        assertEquals(Duration.INFINITE, -1.seconds / (-0.0))
 
         assertEquals(Duration.INFINITE, Duration.INFINITE / Int.MAX_VALUE)
         assertEquals(Duration.INFINITE, -Duration.INFINITE / Int.MIN_VALUE)
@@ -478,10 +485,10 @@ class DurationTest {
 
     @Test
     fun divisionByDuration() {
-        assertEquals(24.0, Duration.days(1) / Duration.hours(1))
+        assertEquals(24.0, 1.days / 1.hours)
-        assertEquals(0.1, Duration.minutes(9) / Duration.hours(1.5))
+        assertEquals(0.1, 9.minutes / 1.5.hours)
-        assertEquals(50.0, Duration.microseconds(1) / Duration.nanoseconds(20))
+        assertEquals(50.0, 1.microseconds / 20.nanoseconds)
-        assertEquals(299.0, Duration.days(365 * 299) / Duration.days(365))
+        assertEquals(299.0, (365 * 299).days / 365.days)
 
         assertTrue((Duration.INFINITE / Duration.INFINITE).isNaN())
         assertTrue((Duration.ZERO / Duration.ZERO).isNaN())
@@ -503,31 +510,31 @@ class DurationTest {
         test(Duration.ZERO, "PT0S", "P0D", "PT0H", "PT0M", "P0DT0H", "PT0H0M", "PT0H0S")
 
         // single unit
-        test(Duration.days(1), "PT24H", "P1D", "PT1440M", "PT86400S")
+        test(1.days, "PT24H", "P1D", "PT1440M", "PT86400S")
-        test(Duration.hours(1), "PT1H")
+        test(1.hours, "PT1H")
-        test(Duration.minutes(1), "PT1M")
+        test(1.minutes, "PT1M")
-        test(Duration.seconds(1), "PT1S")
+        test(1.seconds, "PT1S")
-        test(Duration.milliseconds(1), "PT0.001S")
+        test(1.milliseconds, "PT0.001S")
-        test(Duration.microseconds(1), "PT0.000001S")
+        test(1.microseconds, "PT0.000001S")
-        test(Duration.nanoseconds(1), "PT0.000000001S", "PT0.0000000009S")
+        test(1.nanoseconds, "PT0.000000001S", "PT0.0000000009S")
-        test(Duration.nanoseconds(0.9), "PT0.000000001S")
+        test(0.9.nanoseconds, "PT0.000000001S")
 
         // rounded to zero
-        test(Duration.nanoseconds(0.1), "PT0S")
+        test(0.1.nanoseconds, "PT0S")
         test(Duration.ZERO, "PT0S", "PT0.0000000004S")
 
         // several units combined
-        test(Duration.days(1) + Duration.minutes(1), "PT24H1M")
+        test(1.days + 1.minutes, "PT24H1M")
-        test(Duration.days(1) + Duration.seconds(1), "PT24H0M1S")
+        test(1.days + 1.seconds, "PT24H0M1S")
-        test(Duration.days(1) + Duration.milliseconds(1), "PT24H0M0.001S")
+        test(1.days + 1.milliseconds, "PT24H0M0.001S")
-        test(Duration.hours(1) + Duration.minutes(30), "PT1H30M")
+        test(1.hours + 30.minutes, "PT1H30M")
-        test(Duration.hours(1) + Duration.milliseconds(500), "PT1H0M0.500S")
+        test(1.hours + 500.milliseconds, "PT1H0M0.500S")
-        test(Duration.minutes(2) + Duration.milliseconds(500), "PT2M0.500S")
+        test(2.minutes + 500.milliseconds, "PT2M0.500S")
-        test(Duration.milliseconds(90_500), "PT1M30.500S")
+        test(90_500.milliseconds, "PT1M30.500S")
 
         // with sign
-        test(-Duration.days(1) + Duration.minutes(15), "-PT23H45M", "PT-23H-45M", "+PT-24H+15M")
+        test(-1.days + 15.minutes, "-PT23H45M", "PT-23H-45M", "+PT-24H+15M")
-        test(-Duration.days(1) - Duration.minutes(15), "-PT24H15M", "PT-24H-15M", "-PT25H-45M")
+        test(-1.days - 15.minutes, "-PT24H15M", "PT-24H-15M", "-PT25H-45M")
         test(Duration.ZERO, "PT0S", "P1DT-24H", "+PT-1H+60M", "-PT1M-60S")
 
         // infinite
@@ -557,10 +564,8 @@ class DurationTest {
 
     @Test
     fun parseAndFormatInUnits() {
-        var d = with(Duration) {
+        var d = 1.days + 15.hours + 31.minutes + 45.seconds +
-            days(1) + hours(15) + minutes(31) + seconds(45) +
+                678.milliseconds + 920.microseconds + 516.34.nanoseconds
-            milliseconds(678) + microseconds(920) + nanoseconds(516.34)
-        }
 
         fun test(unit: DurationUnit, vararg representations: String) {
             assertFails { d.toString(unit, -1) }
@@ -577,16 +582,16 @@ class DurationTest {
         test(DurationUnit.DAYS, "2d", "1.6d", "1.65d", "1.647d")
         test(DurationUnit.HOURS, "40h", "39.5h", "39.53h")
         test(DurationUnit.MINUTES, "2372m", "2371.8m", "2371.76m")
-        d -= Duration.hours(39)
+        d -= 39.hours
         test(DurationUnit.SECONDS, "1906s", "1905.7s", "1905.68s", "1905.679s")
-        d -= Duration.seconds(1904)
+        d -= 1904.seconds
         test(DurationUnit.MILLISECONDS, "1679ms", "1678.9ms", "1678.92ms", "1678.921ms")
-        d -= Duration.milliseconds(1678)
+        d -= 1678.milliseconds
         test(DurationUnit.MICROSECONDS, "921us", "920.5us", "920.52us", "920.516us")
-        d -= Duration.microseconds(920)
+        d -= 920.microseconds
         // no sub-nanosecond precision
         test(DurationUnit.NANOSECONDS, "516ns", "516.0ns", "516.00ns", "516.000ns", "516.0000ns")
-        d = (d - Duration.nanoseconds(516)) / 17
+        d = (d - 516.nanoseconds) / 17
         test(DurationUnit.NANOSECONDS, "0ns", "0.0ns", "0.00ns", "0.000ns", "0.0000ns")
 
         // infinite
@@ -594,14 +599,14 @@ class DurationTest {
 //        test(DurationUnit.DAYS, "2.08e+294d")
 //        test(DurationUnit.NANOSECONDS, "1.80e+308ns")
 
-        assertEquals("0.500000000000s", Duration.seconds(0.5).toString(DurationUnit.SECONDS, 100))
+        assertEquals("0.500000000000s", 0.5.seconds.toString(DurationUnit.SECONDS, 100))
-        assertEquals("99999000000000.000000000000ns", Duration.seconds(99_999).toString(DurationUnit.NANOSECONDS, 15))
+        assertEquals("99999000000000.000000000000ns", 99_999.seconds.toString(DurationUnit.NANOSECONDS, 15))
         assertContains(
             listOf(
                 "-4611686018427388000000000.000000000000ns",
                 "-4611686018427387904000000.000000000000ns"
             ),
-            (-Duration.milliseconds(MAX_MILLIS - 1)).toString(DurationUnit.NANOSECONDS, 15)
+            (-(MAX_MILLIS - 1).milliseconds).toString(DurationUnit.NANOSECONDS, 15)
         )
 
         d = Duration.INFINITE
@@ -643,62 +648,62 @@ class DurationTest {
             }
         }
 
-        test(Duration.days(101), "101d", "2424h")
+        test(101.days, "101d", "2424h")
-        test(Duration.days(45.3), "45d 7h 12m", "45.3d", "45d 7.2h") // 0.3d == 7.2h
+        test(45.3.days, "45d 7h 12m", "45.3d", "45d 7.2h") // 0.3d == 7.2h
-        test(Duration.days(45), "45d")
+        test(45.days, "45d")
 
-        test(Duration.days(40.5), "40d 12h", "40.5d", "40d 720m")
+        test(40.5.days, "40d 12h", "40.5d", "40d 720m")
-        test(Duration.days(40) + Duration.minutes(20), "40d 0h 20m", "40d 20m", "40d 1200s")
+        test(40.days + 20.minutes, "40d 0h 20m", "40d 20m", "40d 1200s")
-        test(Duration.days(40) + Duration.seconds(20), "40d 0h 0m 20s", "40d 20s")
+        test(40.days + 20.seconds, "40d 0h 0m 20s", "40d 20s")
-        test(Duration.days(40) + Duration.nanoseconds(100), "40d 0h 0m 0.000000100s", "40d 100ns")
+        test(40.days + 100.nanoseconds, "40d 0h 0m 0.000000100s", "40d 100ns")
 
-        test(Duration.hours(40) + Duration.minutes(15), "1d 16h 15m", "40h 15m")
+        test(40.hours + 15.minutes, "1d 16h 15m", "40h 15m")
-        test(Duration.hours(40), "1d 16h", "40h")
+        test(40.hours, "1d 16h", "40h")
 
-        test(Duration.hours(12.5), "12h 30m")
+        test(12.5.hours, "12h 30m")
-        test(Duration.hours(12) + Duration.seconds(15), "12h 0m 15s")
+        test(12.hours + 15.seconds, "12h 0m 15s")
-        test(Duration.hours(12) + Duration.nanoseconds(1), "12h 0m 0.000000001s")
+        test(12.hours + 1.nanoseconds, "12h 0m 0.000000001s")
-        test(Duration.minutes(30), "30m")
+        test(30.minutes, "30m")
-        test(Duration.minutes(17.5), "17m 30s")
+        test(17.5.minutes, "17m 30s")
 
-        test(Duration.minutes(16.5), "16m 30s")
+        test(16.5.minutes, "16m 30s")
-        test(Duration.seconds(1097.1), "18m 17.1s")
+        test(1097.1.seconds, "18m 17.1s")
-        test(Duration.seconds(90.36), "1m 30.36s")
+        test(90.36.seconds, "1m 30.36s")
-        test(Duration.seconds(50), "50s")
+        test(50.seconds, "50s")
-        test(Duration.seconds(1.3), "1.3s")
+        test(1.3.seconds, "1.3s")
-        test(Duration.seconds(1), "1s")
+        test(1.seconds, "1s")
 
-        test(Duration.seconds(0.5), "500ms")
+        test(0.5.seconds, "500ms")
-        test(Duration.milliseconds(40.2), "40.2ms")
+        test(40.2.milliseconds, "40.2ms")
-        test(Duration.milliseconds(4.225), "4.225ms")
+        test(4.225.milliseconds, "4.225ms")
-        test(Duration.milliseconds(4.24501), "4.245010ms", "4ms 245us 10ns")
+        test(4.24501.milliseconds, "4.245010ms", "4ms 245us 10ns")
-        test(Duration.milliseconds(1), "1ms")
+        test(1.milliseconds, "1ms")
 
-        test(Duration.milliseconds(0.75), "750us")
+        test(0.75.milliseconds, "750us")
-        test(Duration.microseconds(75.35), "75.35us")
+        test(75.35.microseconds, "75.35us")
-        test(Duration.microseconds(7.25), "7.25us")
+        test(7.25.microseconds, "7.25us")
-        test(Duration.microseconds(1.035), "1.035us")
+        test(1.035.microseconds, "1.035us")
-        test(Duration.microseconds(1.005), "1.005us")
+        test(1.005.microseconds, "1.005us")
-        test(Duration.nanoseconds(1800), "1.8us", "1800ns", "0.0000000005h")
+        test(1800.nanoseconds, "1.8us", "1800ns", "0.0000000005h")
 
-        test(Duration.nanoseconds(950.5), "951ns")
+        test(950.5.nanoseconds, "951ns")
-        test(Duration.nanoseconds(85.23), "85ns")
+        test(85.23.nanoseconds, "85ns")
-        test(Duration.nanoseconds(8.235), "8ns")
+        test(8.235.nanoseconds, "8ns")
-        test(Duration.nanoseconds(1), "1ns", "0.9ns", "0.001us", "0.0009us")
+        test(1.nanoseconds, "1ns", "0.9ns", "0.001us", "0.0009us")
-        test(Duration.nanoseconds(1.3), "1ns")
+        test(1.3.nanoseconds, "1ns")
-        test(Duration.nanoseconds(0.75), "1ns")
+        test(0.75.nanoseconds, "1ns")
-        test(Duration.nanoseconds(0.7512), "1ns")
+        test(0.7512.nanoseconds, "1ns")
 
         // equal to zero
-//        test(Duration.nanoseconds(0.023), "0.023ns")
+//        test(0.023.nanoseconds, "0.023ns")
-//        test(Duration.nanoseconds(0.0034), "0.0034ns")
+//        test(0.0034.nanoseconds, "0.0034ns")
-//        test(Duration.nanoseconds(0.0000035), "0.0000035ns")
+//        test(0.0000035.nanoseconds, "0.0000035ns")
 
         test(Duration.ZERO, "0s", "0.4ns", "0000.0000ns")
-        test(Duration.days(365) * 10000, "3650000d")
+        test(365.days * 10000, "3650000d")
-        test(Duration.days(300) * 100000, "30000000d")
+        test(300.days * 100000, "30000000d")
-        test(Duration.days(365) * 100000, "36500000d")
+        test(365.days * 100000, "36500000d")
-        test(Duration.milliseconds(MAX_MILLIS - 1), "53375995583d 15h 36m 27.902s") // max finite value
+        test((MAX_MILLIS - 1).milliseconds, "53375995583d 15h 36m 27.902s") // max finite value
 
         // all infinite
 //        val universeAge = Duration.days(365.25) * 13.799e9

libraries/stdlib/test/time/MeasureTimeTest.kt

@@ -9,6 +9,7 @@ package test.time
 import kotlin.random.Random
 import kotlin.test.*
 import kotlin.time.*
+import kotlin.time.Duration.Companion.nanoseconds
 
 class MeasureTimeTest {
 
@@ -52,20 +53,20 @@ class MeasureTimeTest {
         val timeSource = TestTimeSource()
         val expectedNs = Random.nextLong(1_000_000_000L)
         val elapsed = timeSource.measureTime {
-            timeSource += Duration.nanoseconds(expectedNs)
+            timeSource += expectedNs.nanoseconds
         }
 
-        assertEquals(Duration.nanoseconds(expectedNs), elapsed)
+        assertEquals(expectedNs.nanoseconds, elapsed)
 
         val expectedResult: Long
 
         val (result, elapsed2) = timeSource.measureTimedValue {
-            timeSource += Duration.nanoseconds(expectedNs)
+            timeSource += expectedNs.nanoseconds
             expectedResult = expectedNs
             expectedNs
         }
 
         assertEquals(expectedResult, result)
-        assertEquals(Duration.nanoseconds(result), elapsed2)
+        assertEquals(result.nanoseconds, elapsed2)
     }
 }

libraries/stdlib/test/time/TestTimeSourceTest.kt

@@ -8,19 +8,20 @@ package test.time
 
 import kotlin.test.*
 import kotlin.time.*
+import kotlin.time.Duration.Companion.nanoseconds
 
 class TestTimeSourceTest {
 
     @Test
     fun overflows() {
-        for (enormousDuration in listOf(Duration.INFINITE, Duration.nanoseconds(Double.MAX_VALUE), Duration.nanoseconds(Long.MAX_VALUE) * 2)) {
+        for (enormousDuration in listOf(Duration.INFINITE, Double.MAX_VALUE.nanoseconds, Long.MAX_VALUE.nanoseconds * 2)) {
             assertFailsWith<IllegalStateException>(enormousDuration.toString()) { TestTimeSource() += enormousDuration }
             assertFailsWith<IllegalStateException>((-enormousDuration).toString()) { TestTimeSource() += -enormousDuration }
         }
 
-        val moderatePositiveDuration = Duration.nanoseconds(Long.MAX_VALUE) / 1.5
+        val moderatePositiveDuration = Long.MAX_VALUE.nanoseconds / 1.5
-        val borderlineQuarterPositiveDuration = Duration.nanoseconds(Long.MAX_VALUE / 4) // precise number of ns
+        val borderlineQuarterPositiveDuration = (Long.MAX_VALUE / 4).nanoseconds // precise number of ns
-        val borderlineQuarterNegativeDuration = Duration.nanoseconds(Long.MIN_VALUE / 4)
+        val borderlineQuarterNegativeDuration = (Long.MIN_VALUE / 4).nanoseconds
         run {
             val timeSource = TestTimeSource()
             timeSource += moderatePositiveDuration
@@ -29,19 +30,19 @@ class TestTimeSourceTest {
         run {
             val timeSource = TestTimeSource()
             repeat(4) { timeSource += borderlineQuarterPositiveDuration }
-            assertFailsWith<IllegalStateException>("Should overflow positive") { timeSource += Duration.nanoseconds(4) }
+            assertFailsWith<IllegalStateException>("Should overflow positive") { timeSource += 4.nanoseconds }
         }
         run {
             val timeSource = TestTimeSource()
             repeat(4) { timeSource += borderlineQuarterNegativeDuration }
-            assertFailsWith<IllegalStateException>("Should overflow negative") { timeSource += -Duration.nanoseconds(4) }
+            assertFailsWith<IllegalStateException>("Should overflow negative") { timeSource += -4.nanoseconds }
         }
 
         run {
             val timeSource = TestTimeSource()
             timeSource += moderatePositiveDuration
             // does not overflow even if duration doesn't fit in long, but the result fits
-            timeSource += -moderatePositiveDuration - Duration.nanoseconds(Long.MAX_VALUE)
+            timeSource += -moderatePositiveDuration - Long.MAX_VALUE.nanoseconds
         }
     }
 
@@ -51,12 +52,12 @@ class TestTimeSourceTest {
         val mark = timeSource.markNow()
 
         repeat(10_000) {
-            timeSource += Duration.nanoseconds(0.4)
+            timeSource += 0.4.nanoseconds
 
             assertEquals(Duration.ZERO, mark.elapsedNow())
         }
 
-        timeSource += Duration.nanoseconds(1.9)
+        timeSource += 1.9.nanoseconds
-        assertEquals(Duration.nanoseconds(2), mark.elapsedNow())
+        assertEquals(2.nanoseconds, mark.elapsedNow())
     }
 }

libraries/stdlib/test/time/TimeMarkTest.kt

@@ -8,6 +8,8 @@ package test.time
 
 import kotlin.test.*
 import kotlin.time.*
+import kotlin.time.Duration.Companion.milliseconds
+import kotlin.time.Duration.Companion.nanoseconds
 
 class TimeMarkTest {
 
@@ -27,19 +29,19 @@ class TimeMarkTest {
         }
 
         val mark = timeSource.markNow()
-        val markFuture1 = (mark + Duration.milliseconds(1)).apply { assertHasPassed(false) }
+        val markFuture1 = (mark + 1.milliseconds).apply { assertHasPassed(false) }
-        val markFuture2 = (mark - Duration.milliseconds((-1))).apply { assertHasPassed(false) }
+        val markFuture2 = (mark - (-1).milliseconds).apply { assertHasPassed(false) }
 
-        val markPast1 = (mark - Duration.milliseconds(1)).apply { assertHasPassed(true) }
+        val markPast1 = (mark - 1.milliseconds).apply { assertHasPassed(true) }
-        val markPast2 = (markFuture1 + Duration.milliseconds((-2))).apply { assertHasPassed(true) }
+        val markPast2 = (markFuture1 + (-2).milliseconds).apply { assertHasPassed(true) }
 
-        timeSource += Duration.nanoseconds(500_000)
+        timeSource += 500_000.nanoseconds
 
         val elapsed = mark.elapsedNow()
-        val elapsedFromFuture = elapsed - Duration.milliseconds(1)
+        val elapsedFromFuture = elapsed - 1.milliseconds
-        val elapsedFromPast = elapsed + Duration.milliseconds(1)
+        val elapsedFromPast = elapsed + 1.milliseconds
 
-        assertEquals(Duration.milliseconds(0.5), elapsed)
+        assertEquals(0.5.milliseconds, elapsed)
         assertEquals(elapsedFromFuture, markFuture1.elapsedNow())
         assertEquals(elapsedFromFuture, markFuture2.elapsedNow())
 
@@ -49,7 +51,7 @@ class TimeMarkTest {
         markFuture1.assertHasPassed(false)
         markPast1.assertHasPassed(true)
 
-        timeSource += Duration.milliseconds(1)
+        timeSource += 1.milliseconds
 
         markFuture1.assertHasPassed(true)
         markPast1.assertHasPassed(true)