Code samples for Kotlin Durations

Author: yadavan88

core-kotlin-modules/core-kotlin-date-time/src/test/kotlin/com/baeldung/duration/DurationUnitTest.kt

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+package com.baeldung.duration
+
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+import kotlin.time.Duration
+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
+import kotlin.time.DurationUnit
+import kotlin.time.toDuration
+import kotlin.time.toJavaDuration
+import java.time.Duration as JavaDuration
+
+class DurationUnitTest {
+    @Test
+    fun `given numeric values, create duration instance using companion`() {
+        val tenMinutes = 10.minutes
+        assertEquals(10L, tenMinutes.inWholeMinutes)
+        assertEquals(600L, tenMinutes.inWholeSeconds)
+        val tenSeconds = 10.seconds
+        assertEquals(10L, tenSeconds.inWholeSeconds)
+        val zero = Duration.ZERO
+        assertEquals(0L, zero.inWholeMicroseconds)
+    }
+
+    @Test
+    fun `given numeric values, create duration instance using toDuration and unit`() {
+        val tenMinutes = 10.toDuration(DurationUnit.MINUTES)
+        assertEquals(10L, tenMinutes.inWholeMinutes)
+        assertEquals(600L, tenMinutes.inWholeSeconds)
+        val tenSeconds = 10.toDuration(DurationUnit.SECONDS)
+        assertEquals(10L, tenSeconds.inWholeSeconds)
+        val zero = Duration.ZERO
+        assertEquals(0L, zero.inWholeMicroseconds)
+        val infinite = Duration.INFINITE
+        assertEquals(true, infinite.isInfinite())
+    }
+
+    @Test
+    fun `given ISO8601 string values, create duration instance`() {
+        val tenMinDuration = Duration.parseIsoString("PT10M")
+        assertEquals(600L, tenMinDuration.inWholeSeconds)
+        assertEquals("PT10M", tenMinDuration.toIsoString())
+        val tenDays = Duration.parseIsoString("P10D")
+        assertEquals(10L, tenDays.inWholeDays)
+        val tenDaysAndOneHour = Duration.parseIsoString("P10DT1H")
+        assertEquals(241L, tenDaysAndOneHour.inWholeHours)
+        assertEquals("PT241H", tenDaysAndOneHour.toIsoString())
+        val tenDaysWithAllUnits = Duration.parseIsoString("P10DT1H5M7S")
+        assertEquals(867907L, tenDaysWithAllUnits.inWholeSeconds)
+    }
+
+    @Test
+    fun `given a duration, convert into java duration`() {
+        val sixHundredSeconds = 600.seconds
+        val javaDuration: java.time.Duration = sixHundredSeconds.toJavaDuration()
+        val javaDurationInst = JavaDuration.ofSeconds(600)
+        assertEquals(javaDuration, javaDurationInst)
+    }
+
+    @Test
+    fun `given two different durations, combine them into single duration`() {
+        val tenMinutes = 10.minutes
+        val fiveHours = 5.hours
+        val fiveHoursPlusTenMin = tenMinutes + fiveHours
+        assertEquals(310L, fiveHoursPlusTenMin.inWholeMinutes)
+        val fiveHoursMinusTenMin = fiveHours - tenMinutes
+        assertEquals(290L, fiveHoursMinusTenMin.inWholeMinutes)
+        val timesMinutes = tenMinutes.times(3)
+        assertEquals(30L, timesMinutes.inWholeMinutes)
+        val sixSecs = tenMinutes.div(100)
+        assertEquals(6, sixSecs.inWholeSeconds)
+    }
+
+    @Test
+    fun `given two different durations, check if they are equal`() {
+        val tenMinutes = 10.minutes
+        val sixHundredSeconds = 600.seconds
+        assert(tenMinutes == sixHundredSeconds)
+    }
+
+    @Test
+    fun `given two different durations, compare them`() {
+        val tenMinutes = 10.minutes
+        val fiveHours = 5.hours
+        assertTrue { fiveHours > tenMinutes }
+        assertFalse { fiveHours < tenMinutes }
+        assertTrue { fiveHours == 300.minutes }
+        assertTrue { fiveHours.isPositive() }
+    }
+
+    @Test
+    fun `given a duration, break down into smaller parts`() {
+        val seventyMinutes = 70.minutes
+        val asStr = seventyMinutes.toComponents { hrs, min, sec, nanos -> "${hrs}:${min}" }
+        assertEquals("1:10", asStr)
+    }
+
+}