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fabiotadashifabiotadashi
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date time kotlinx (#1074)
* date time kotlinx * resolve PR comments * fix imports * functions refactoring * refactor test * assert changes * change logger to assert
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‎core-kotlin-modules/core-kotlin-date-time/pom.xml

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<properties>
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<joda-time.version>2.12.1</joda-time.version>
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<kotlinx-datetime.version>0.4.0</kotlinx-datetime.version>
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<kotlinx-datetime.version>0.6.0</kotlinx-datetime.version>
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</properties>
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</project>

‎core-kotlin-modules/core-kotlin-date-time/src/main/kotlin/com/baeldung/dates/kotlinxDatetime/KotlinxDateTimeOperations.kt

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package com.baeldung.dates.kotlinxDatetime
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import kotlinx.datetime.*
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import kotlinx.datetime.format.DateTimeFormat
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import kotlinx.datetime.format.char
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import org.slf4j.LoggerFactory
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class KotlinxDateTimeOperations {
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val logger = LoggerFactory.getLogger(KotlinxDateTimeOperations::class.java)
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fun getInstant(): Instant {
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val instant = Clock.System.now()
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logger.info(instant.toString())
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return instant
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}
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fun getLocalDateTimeBrazilTimeZoneFromInstant(instant: Instant): LocalDateTime {
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val timeZoneFromString = TimeZone.of("Brazil/East")
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val localDateTimeBrazil = instant.toLocalDateTime(timeZoneFromString)
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logger.info(localDateTimeBrazil.toString())
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return localDateTimeBrazil
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}
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fun getLocalDateTimeUtcMinus3TimeZoneFromInstant(instant: Instant): LocalDateTime {
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val timeZoneFromUTCString = TimeZone.of("UTC-3")
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val localDateUtcMinus3 = instant.toLocalDateTime(timeZoneFromUTCString)
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logger.info(localDateUtcMinus3.toString())
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return localDateUtcMinus3
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}
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fun createLocalDateTime(): LocalDateTime {
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val localDateTime = LocalDateTime(year = 2024, month = Month.JULY, dayOfMonth = 31, hour = 11, minute = 10, second = 0, nanosecond = 0)
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return localDateTime
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}
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fun getLocalDate(): LocalDate {
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val localDate = LocalDate(year = 2024, month = Month.JULY, dayOfMonth = 31)
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return localDate
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}
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fun convertInstantToLocalDate(instant: Instant): LocalDate {
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val localDate = instant.toLocalDateTime(TimeZone.currentSystemDefault()).date
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return localDate
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}
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fun getLocalTime(): LocalTime {
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val hourMinute = LocalTime(hour = 10, minute = 30)
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val localTimeSeconds = LocalTime(hour = 10, minute = 30, second = 15)
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val localTimeNanoseconds = LocalTime(hour = 10, minute = 30, second = 15, nanosecond = 50)
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return hourMinute
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}
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fun convertInstantToLocalTime(instant: Instant): LocalTime {
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val localTime = instant.toLocalDateTime(TimeZone.currentSystemDefault()).time
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return localTime
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}
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fun compareInstantAndEpochMilliseconds(): Long {
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val instant = Instant.fromEpochMilliseconds(epochMilliseconds = 1722475458286)
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val epochMilliseconds = instant.toEpochMilliseconds()
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return epochMilliseconds
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}
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fun parseStringToInstant(): Instant {
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val instant = Instant.parse("2024-07-31T22:19:44.475Z")
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return instant
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}
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fun parseStringToLocalDateTime(): LocalDateTime {
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val localDateTime = LocalDateTime.parse("2024-07-31T22:19")
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return localDateTime
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}
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fun parseStringToLocalDate(): LocalDate {
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val localDate = LocalDate.parse("2024-07-31")
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return localDate
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}
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fun parseStringToLocalTime(): LocalTime {
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val localTime = LocalTime.parse("10:19:22.111")
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return localTime
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}
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fun getDateTimeFormat(): DateTimeFormat<LocalDate> {
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val dateFormat = LocalDate.Format {
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dayOfMonth()
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char('/')
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monthNumber()
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char('/')
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year()
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}
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val localDate = LocalDate.parse(input = "31/07/2024", format = dateFormat)
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logger.info(localDate.format(dateFormat))
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return dateFormat
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}
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fun addAndSubtract() {
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val instant = Clock.System.now()
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val tenDaysFromNow: Instant = instant.plus(10, DateTimeUnit.DAY, TimeZone.UTC)
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val tenDaysBeforeNow: Instant = instant.minus(10, DateTimeUnit.DAY, TimeZone.UTC)
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val localDate = LocalDate(year = 2024, month = Month.JULY, dayOfMonth = 31)
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val oneYearFromLocalDate = localDate.plus(1, DateTimeUnit.YEAR)
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val oneYearBeforeLocalDate = localDate.minus(1, DateTimeUnit.YEAR)
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}
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fun addMinutesToLocalDateTime() {
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val localDateTime = LocalDateTime(year = 2024, month = Month.JULY, dayOfMonth = 31, hour = 11, minute = 10, second = 0, nanosecond = 0)
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val timeZone = TimeZone.of("Brazil/West")
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val instant = localDateTime.toInstant(timeZone)
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val fiveMinutesAfter = instant.plus(5, DateTimeUnit.MINUTE)
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val localDateTimeFiveMinutesAfter = fiveMinutesAfter.toLocalDateTime(timeZone)
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}
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}

‎core-kotlin-modules/core-kotlin-date-time/src/test/kotlin/com/baeldung/kotlinxDateTime/KotlinxDateTimeOperationsUnitTest.kt

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package com.baeldung.kotlinxDateTime
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import com.baeldung.dates.kotlinxDatetime.KotlinxDateTimeOperations
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import kotlinx.datetime.*
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import kotlinx.datetime.format.DateTimeComponents
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import kotlinx.datetime.format.MonthNames
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import kotlinx.datetime.format.char
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import org.junit.jupiter.api.BeforeEach
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import org.junit.jupiter.api.Test
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import org.junit.jupiter.api.assertDoesNotThrow
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import kotlin.test.assertEquals
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import kotlin.test.assertTrue
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class KotlinxDateTimeOperationsUnitTest {
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@Test
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fun `given an Instant convert it to LocalDateTime`() {
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java.util.TimeZone.setDefault(java.util.TimeZone.getTimeZone("UTC"));
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val instant = Instant.fromEpochSeconds(1722427200)
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assertEquals("2024-07-31T12:00:00Z", instant.toString())
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val localDateTime = instant.toLocalDateTime(TimeZone.currentSystemDefault()) // System is in UTC
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assertEquals("2024-07-31T12:00", localDateTime.toString())
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}
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@Test
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fun `compare two LocalDateTime from different from the same TimeZone`() {
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val kotlinxDateTimeOperations = KotlinxDateTimeOperations()
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val instant = Instant.fromEpochSeconds(1722427200)
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val localDateTimeBrazil = kotlinxDateTimeOperations.getLocalDateTimeBrazilTimeZoneFromInstant(instant = instant)
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assertEquals("2024-07-31T09:00", localDateTimeBrazil.toString())
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val localDateTimeUtcMinus3 = kotlinxDateTimeOperations.getLocalDateTimeUtcMinus3TimeZoneFromInstant(instant = instant)
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assertEquals("2024-07-31T09:00", localDateTimeUtcMinus3.toString())
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}
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@Test
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fun `create a LocalDateTime from function`() {
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val kotlinxDateTimeOperations = KotlinxDateTimeOperations()
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val localDateTime = kotlinxDateTimeOperations.createLocalDateTime()
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assertTrue { localDateTime is LocalDateTime }
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}
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@Test
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fun `given an Instant create a LocalDate`() {
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val kotlinxDateTimeOperations = KotlinxDateTimeOperations()
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val localDate = kotlinxDateTimeOperations.getLocalDate()
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assertTrue { localDate is LocalDate }
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val instant = kotlinxDateTimeOperations.getInstant()
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val localDateFromInstant = kotlinxDateTimeOperations.convertInstantToLocalDate(instant)
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assertTrue { localDateFromInstant is LocalDate }
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}
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@Test
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fun `given an Instant create a LocalTime`() {
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val kotlinxDateTimeOperations = KotlinxDateTimeOperations()
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val localTime = kotlinxDateTimeOperations.getLocalTime()
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assertTrue { localTime is LocalTime }
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val instant = kotlinxDateTimeOperations.getInstant()
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val localTimeFromInstant = kotlinxDateTimeOperations.convertInstantToLocalTime(instant)
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assertTrue { localTimeFromInstant is LocalTime }
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}
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@Test
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fun `get EpochMilliSeconds from function`() {
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val kotlinxDateTimeOperations = KotlinxDateTimeOperations()
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val epochMilliseconds = kotlinxDateTimeOperations.compareInstantAndEpochMilliseconds()
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assertEquals(1722475458286, epochMilliseconds)
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}
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@Test
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fun `parse String using different functions`() {
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val kotlinxDateTimeOperations = KotlinxDateTimeOperations()
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val instant = kotlinxDateTimeOperations.parseStringToInstant()
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assertTrue { instant is Instant }
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val localDateTime = kotlinxDateTimeOperations.parseStringToLocalDateTime()
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assertTrue { localDateTime is LocalDateTime }
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val localDate = kotlinxDateTimeOperations.parseStringToLocalDate()
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assertTrue { localDate is LocalDate }
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val localTime = kotlinxDateTimeOperations.parseStringToLocalTime()
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assertTrue { localTime is LocalTime }
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val dateTimeFormat = kotlinxDateTimeOperations.getDateTimeFormat()
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assertEquals("31/07/2024", dateTimeFormat.format(localDate))
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}
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@Test
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fun `get DateTimeComponents from function`() {
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val monthDay = DateTimeComponents.Format {
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dayOfMonth()
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char('-')
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monthName(MonthNames.ENGLISH_FULL)
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}.parse("31-July")
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assertEquals("7", monthDay.monthNumber.toString())
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assertEquals("JULY", monthDay.month.toString())
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assertEquals("31", monthDay.dayOfMonth.toString())
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}
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@Test
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fun `compare Duration from two Instants`() {
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val instant = Instant.parse("2024-07-31T22:00:00.000Z")
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val olderInstant = Instant.parse("2024-03-15T22:00:00.000Z")
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val duration = instant - olderInstant
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assertEquals(138, duration.inWholeDays)
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assertEquals(11923200000000000, duration.inWholeNanoseconds)
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}
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@Test
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fun `get DateTimePeriod from two Instants`() {
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val instant = Instant.parse("2024-07-31T22:00:00.000Z")
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val olderInstant = Instant.parse("2022-03-15T12:05:01.050Z")
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val dateTimePeriod = olderInstant.periodUntil(instant, TimeZone.UTC)
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assertEquals(2, dateTimePeriod.years)
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assertEquals(4, dateTimePeriod.months)
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assertEquals(16, dateTimePeriod.days)
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assertEquals(9, dateTimePeriod.hours)
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assertEquals(54, dateTimePeriod.minutes)
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assertEquals(58, dateTimePeriod.seconds)
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assertEquals(950000000, dateTimePeriod.nanoseconds)
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}
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@Test
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fun `get months between function result`() {
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val instant = Instant.parse("2024-07-31T22:00:00.000Z")
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val olderInstant = Instant.parse("2024-03-15T22:00:00.000Z")
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val monthsUntil = olderInstant.monthsUntil(instant, TimeZone.UTC)
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val months = olderInstant.until(instant, DateTimeUnit.MONTH, TimeZone.UTC)
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assertEquals(4, monthsUntil.toLong())
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assertEquals(4, months)
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}
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@Test
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fun `run arithmetic operations funcitons`() {
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val kotlinxDateTimeOperations = KotlinxDateTimeOperations()
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assertDoesNotThrow {
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kotlinxDateTimeOperations.addAndSubtract()
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kotlinxDateTimeOperations.addMinutesToLocalDateTime()
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}
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}
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}

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