Change Duration.INFINITE.toIsoString representation

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

@@ -20,7 +20,7 @@ class Durations {
         assertPrints(Duration.seconds(86420).toIsoString(), "PT24H0M20S")
         assertPrints(Duration.days(2).toIsoString(), "PT48H")
         assertPrints(Duration.ZERO.toIsoString(), "PT0S")
-        assertPrints(Duration.INFINITE.toIsoString(), "PT2147483647H")
+        assertPrints(Duration.INFINITE.toIsoString(), "PT9999999999999H")
     }
 
     @Sample

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

@@ -764,8 +764,14 @@ public value class Duration internal constructor(private val rawValue: Long) : C
     public fun toIsoString(): String = buildString {
         if (isNegative()) append('-')
         append("PT")
-        absoluteValue.toComponents { hours, minutes, seconds, nanoseconds ->
-            val hasHours = hours != 0
+        val absoluteValue = this@Duration.absoluteValue
+        absoluteValue.toComponents { _, minutes, seconds, nanoseconds ->
+            var hours = absoluteValue.inWholeHours
+            if (isInfinite()) {
+                // use large enough value instead of Long.MAX_VALUE
+                hours = 9_999_999_999_999
+            }
+            val hasHours = hours != 0L
             val hasSeconds = seconds != 0 || nanoseconds != 0
             val hasMinutes = minutes != 0 || (hasSeconds && hasHours)
             if (hasHours) {

libraries/stdlib/test/time/DurationTest.kt

@@ -485,7 +485,7 @@ class DurationTest {
         assertEquals("-PT24H15M", (-Duration.days(1) - Duration.minutes(15)).toIsoString())
 
         // infinite
-        assertEquals("PT2147483647H", Duration.INFINITE.toIsoString())
+        assertEquals("PT9999999999999H", Duration.INFINITE.toIsoString())
     }
 
     @Test