diff --git a/libraries/stdlib/js/src/kotlin/time/DurationUnit.kt b/libraries/stdlib/js/src/kotlin/time/DurationUnit.kt
index af1028026d5..f0627fd2be8 100644
--- a/libraries/stdlib/js/src/kotlin/time/DurationUnit.kt
+++ b/libraries/stdlib/js/src/kotlin/time/DurationUnit.kt
@@ -37,7 +37,7 @@ public actual enum class DurationUnit(internal val scale: Double) {
     DAYS(86400e9);
 }
 
-public actual fun convertDurationUnit(value: Double, sourceUnit: DurationUnit, targetUnit: DurationUnit): Double {
+internal actual fun convertDurationUnit(value: Double, sourceUnit: DurationUnit, targetUnit: DurationUnit): Double {
     val sourceCompareTarget = sourceUnit.scale.compareTo(targetUnit.scale)
     return when {
         sourceCompareTarget > 0 -> value * (sourceUnit.scale / targetUnit.scale)
diff --git a/libraries/stdlib/jvm/src/kotlin/time/DurationUnitJvm.kt b/libraries/stdlib/jvm/src/kotlin/time/DurationUnitJvm.kt
index 466f5e273cd..6da24720647 100644
--- a/libraries/stdlib/jvm/src/kotlin/time/DurationUnitJvm.kt
+++ b/libraries/stdlib/jvm/src/kotlin/time/DurationUnitJvm.kt
@@ -10,7 +10,7 @@ package kotlin.time
 
 public actual typealias DurationUnit = java.util.concurrent.TimeUnit
 
-public actual fun convertDurationUnit(value: Double, sourceUnit: DurationUnit, targetUnit: DurationUnit): Double {
+internal actual fun convertDurationUnit(value: Double, sourceUnit: DurationUnit, targetUnit: DurationUnit): Double {
     val sourceInTargets = targetUnit.convert(1, sourceUnit)
     if (sourceInTargets > 0)
         return value * sourceInTargets
diff --git a/libraries/stdlib/src/kotlin/time/Duration.kt b/libraries/stdlib/src/kotlin/time/Duration.kt
index 10d7fb78912..6e28afc3ab8 100644
--- a/libraries/stdlib/src/kotlin/time/Duration.kt
+++ b/libraries/stdlib/src/kotlin/time/Duration.kt
@@ -34,6 +34,10 @@ public inline class Duration internal constructor(internal val value: Double) :
     companion object {
         val ZERO: Duration = Duration(0.0)
         val INFINITE: Duration = Duration(Double.POSITIVE_INFINITY)
+
+        /** Converts the given time duration [value] expressed in the specified [sourceUnit] into the specified [targetUnit]. */
+        public fun convert(value: Double, sourceUnit: DurationUnit, targetUnit: DurationUnit): Double =
+            convertDurationUnit(value, sourceUnit, targetUnit)
     }
 
     // arithmetic operators
diff --git a/libraries/stdlib/src/kotlin/time/DurationUnit.kt b/libraries/stdlib/src/kotlin/time/DurationUnit.kt
index 9bdc5a73ae8..5fa8e1c945c 100644
--- a/libraries/stdlib/src/kotlin/time/DurationUnit.kt
+++ b/libraries/stdlib/src/kotlin/time/DurationUnit.kt
@@ -46,7 +46,7 @@ public expect enum class DurationUnit {
 }
 
 /** Converts the given time duration [value] expressed in the specified [sourceUnit] into the specified [targetUnit]. */
-public expect fun convertDurationUnit(value: Double, sourceUnit: DurationUnit, targetUnit: DurationUnit): Double
+internal expect fun convertDurationUnit(value: Double, sourceUnit: DurationUnit, targetUnit: DurationUnit): Double
 
 
 
diff --git a/libraries/stdlib/test/time/DurationTest.kt b/libraries/stdlib/test/time/DurationTest.kt
index 5214ae4274f..72a8b91871c 100644
--- a/libraries/stdlib/test/time/DurationTest.kt
+++ b/libraries/stdlib/test/time/DurationTest.kt
@@ -52,7 +52,7 @@ class DurationTest {
             repeat(10) {
                 val d1 = value.toDuration(unit)
                 val unit2 = units.random()
-                val value2 = convertDurationUnit(value, unit, unit2)
+                val value2 = Duration.convert(value, unit, unit2)
                 val d2 = value2.toDuration(unit2)
                 assertEquals(d1, d2, "$value $unit in $unit2")
                 assertEquals(d1.hashCode(), d2.hashCode())
@@ -124,7 +124,7 @@ class DurationTest {
             val unit = units.random()
             val unit2 = units.random()
 
-            assertAlmostEquals(convertDurationUnit(value.toDouble(), unit, unit2), value.toDuration(unit).toDouble(unit2))
+            assertAlmostEquals(Duration.convert(value.toDouble(), unit, unit2), value.toDuration(unit).toDouble(unit2))
         }
     }
 
diff --git a/libraries/stdlib/test/time/DurationUnitTest.kt b/libraries/stdlib/test/time/DurationUnitTest.kt
index 566e2e869a3..2a441abbeb6 100644
--- a/libraries/stdlib/test/time/DurationUnitTest.kt
+++ b/libraries/stdlib/test/time/DurationUnitTest.kt
@@ -22,11 +22,11 @@ class DurationUnitTest {
     fun conversion() {
         fun test(sourceValue: Double, sourceUnit: DurationUnit, targetValue: Double, targetUnit: DurationUnit) {
             assertEquals(
-                targetValue, convertDurationUnit(sourceValue, sourceUnit, targetUnit),
+                targetValue, Duration.convert(sourceValue, sourceUnit, targetUnit),
                 "Expected $sourceValue $sourceUnit to be $targetValue $targetUnit"
             )
             assertEquals(
-                sourceValue, convertDurationUnit(targetValue, targetUnit, sourceUnit),
+                sourceValue, Duration.convert(targetValue, targetUnit, sourceUnit),
                 "Expected $targetValue $targetUnit to be $sourceValue $sourceUnit"
             )
         }