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BAEL-896 Working with dates in Kotlin

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-Moved snippets to test, now using assertions instead of println
This commit is contained in:
Dhawal Kapil 2018-11-05 15:37:48 +05:30
parent 30ce976481
commit 1cad5abf84
8 changed files with 140 additions and 125 deletions
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31
kotlin-libraries/src/main/kotlin/com/baeldung/kotlin/dates/CreateDate.kt
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package com.baeldung.kotlin.dates
import java.time.LocalDate
import java.time.format.DateTimeFormatter
fun createDateUsingParseMethodDefaultFormat() {
var date = LocalDate.parse("2018-12-31")
println(date)
}
fun createDateUsingParseMethodCustomFormat() {
var formatter = DateTimeFormatter.ofPattern("dd-MM-yyyy")
var date = LocalDate.parse("31-12-2018", formatter)
println(date)
}
fun createDateUsingOfMethod() {
var date = LocalDate.of(2018, 12, 31)
println(date)
}
fun main(args: Array<String>) {
createDateUsingParseMethodCustomFormat()
createDateUsingOfMethod()
}

24
kotlin-libraries/src/main/kotlin/com/baeldung/kotlin/dates/ExtractDate.kt
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package com.baeldung.kotlin.dates
import java.time.LocalDate
fun extractingCommonComponents() {
var date = LocalDate.parse("2018-12-31")
println(date.year)
println(date.month)
println(date.dayOfMonth)
}
fun extractingEraDowDoy() {
var date = LocalDate.parse("2018-12-31")
println(date.era)
println(date.dayOfWeek)
println(date.dayOfYear)
}
fun main(args: Array<String>) {
extractingCommonComponents()
extractingEraDowDoy()
}

44
kotlin-libraries/src/main/kotlin/com/baeldung/kotlin/dates/PeriodDate.kt
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@ -1,44 +0,0 @@
package com.baeldung.kotlin.dates
import java.time.LocalDate
import java.time.Period
fun createAPeriod() {
var period = Period.of(1, 2, 3)
println(period)
}
fun addAPeriod() {
var period = Period.of(1, 2, 3)
var date = LocalDate.of(2018, 6, 25)
var modifiedDate = date.plus(period)
println(modifiedDate)
}
fun subtractAPeriod() {
var period = Period.of(1, 2, 3)
var date = LocalDate.of(2018, 6, 25)
var modifiedDate = date.minus(period)
println(modifiedDate)
}
fun getAPeriod() {
var date1 = LocalDate.parse("2018-06-25")
var date2 = LocalDate.parse("2018-12-25")
var period = Period.between(date1, date2)
println(period)
}
fun main(args: Array<String>) {
createAPeriod()
addAPeriod()
subtractAPeriod()
getAPeriod()
}

26
kotlin-libraries/src/main/kotlin/com/baeldung/kotlin/dates/PrintDate.kt
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@ -1,26 +0,0 @@
package com.baeldung.kotlin.dates
import java.time.LocalDate
import java.time.format.DateTimeFormatter
fun printDateDefaultFormat() {
var date = LocalDate.parse("2018-12-31")
println(date)
}
fun printDateUsingCustomFormat() {
var date = LocalDate.parse("2018-12-31")
var formatter = DateTimeFormatter.ofPattern("dd-MMMM-yyyy")
var formattedDate = date.format(formatter)
println(formattedDate)
}
fun main(args: Array<String>) {
printDateDefaultFormat()
printDateUsingCustomFormat()
}

34
kotlin-libraries/src/test/kotlin/com/baeldung/kotlin/dates/CreateDateUnitTest.kt Normal file
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package com.baeldung.kotlin.dates
import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.Test
import java.time.LocalDate
import java.time.format.DateTimeFormatter
class CreateDateUnitTest {
@Test
fun givenString_whenDefaultFormat_thenCreated() {
var date = LocalDate.parse("2018-12-31")
assertThat(date).isEqualTo("2018-12-31")
}
@Test
fun givenString_whenCustomFormat_thenCreated() {
var formatter = DateTimeFormatter.ofPattern("dd-MM-yyyy")
var date = LocalDate.parse("31-12-2018", formatter)
assertThat(date).isEqualTo("2018-12-31")
}
@Test
fun givenYMD_whenUsingOf_thenCreated() {
var date = LocalDate.of(2018, 12, 31)
assertThat(date).isEqualTo("2018-12-31")
}
}

29
kotlin-libraries/src/test/kotlin/com/baeldung/kotlin/dates/ExtractDateUnitTest.kt Normal file
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package com.baeldung.kotlin.dates
import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.Test
import java.time.DayOfWeek
import java.time.LocalDate
import java.time.Month
class ExtractDateUnitTest {
@Test
fun givenDate_thenExtractedYMD() {
var date = LocalDate.parse("2018-12-31")
assertThat(date.year).isEqualTo(2018)
assertThat(date.month).isEqualTo(Month.DECEMBER)
assertThat(date.dayOfMonth).isEqualTo(31)
}
@Test
fun givenDate_thenExtractedEraDowDoy() {
var date = LocalDate.parse("2018-12-31")
assertThat(date.era.toString()).isEqualTo("CE")
assertThat(date.dayOfWeek).isEqualTo(DayOfWeek.MONDAY)
assertThat(date.dayOfYear).isEqualTo(365)
}
}

29
kotlin-libraries/src/test/kotlin/com/baeldung/kotlin/dates/FormatDateUnitTest.kt Normal file
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package com.baeldung.kotlin.dates
import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.Test
import java.time.LocalDate
import java.time.format.DateTimeFormatter
class FormatDateUnitTest {
@Test
fun givenDate_whenDefaultFormat_thenFormattedString() {
var date = LocalDate.parse("2018-12-31")
assertThat(date.toString()).isEqualTo("2018-12-31")
}
@Test
fun givenDate_whenCustomFormat_thenFormattedString() {
var date = LocalDate.parse("2018-12-31")
var formatter = DateTimeFormatter.ofPattern("dd-MMMM-yyyy")
var formattedDate = date.format(formatter)
assertThat(formattedDate).isEqualTo("31-December-2018")
}
}

48
kotlin-libraries/src/test/kotlin/com/baeldung/kotlin/dates/PeriodDateUnitTest.kt Normal file
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package com.baeldung.kotlin.dates
import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.Test
import java.time.LocalDate
import java.time.Period
class PeriodDateUnitTest {
@Test
fun givenYMD_thenCreatePeriod() {
var period = Period.of(1, 2, 3)
assertThat(period.toString()).isEqualTo("P1Y2M3D")
}
@Test
fun givenPeriod_whenAdd_thenModifiedDate() {
var period = Period.of(1, 2, 3)
var date = LocalDate.of(2018, 6, 25)
var modifiedDate = date.plus(period)
assertThat(modifiedDate).isEqualTo("2019-08-28")
}
@Test
fun givenPeriod_whenSubtracted_thenModifiedDate() {
var period = Period.of(1, 2, 3)
var date = LocalDate.of(2018, 6, 25)
var modifiedDate = date.minus(period)
assertThat(modifiedDate).isEqualTo("2017-04-22")
}
@Test
fun givenTwoDate_whenUsingBetween_thenDiffOfDates() {
var date1 = LocalDate.parse("2018-06-25")
var date2 = LocalDate.parse("2018-12-25")
var period = Period.between(date1, date2)
assertThat(period.toString()).isEqualTo("P6M")
}
}