diff --git a/core-java-modules/core-java-datetime-conversion/src/test/java/com/baeldung/timestamptolocaldatetime/TimeToLocalDateTimeUnitTest.java b/core-java-modules/core-java-datetime-conversion/src/test/java/com/baeldung/timestamptolocaldatetime/TimeToLocalDateTimeUnitTest.java new file mode 100644 index 0000000000..e8fb821c75 --- /dev/null +++ b/core-java-modules/core-java-datetime-conversion/src/test/java/com/baeldung/timestamptolocaldatetime/TimeToLocalDateTimeUnitTest.java @@ -0,0 +1,42 @@ +package com.baeldung.timestamptolocaldatetime; + +import org.joda.time.DateTimeZone; +import org.junit.Test; + +import java.time.Instant; +import java.time.LocalDateTime; +import java.time.ZoneId; +import java.time.format.DateTimeFormatter; + +import org.joda.time.DateTime; +import org.joda.time.format.DateTimeFormat; + +import static org.junit.Assert.assertEquals; + +public class TimeToLocalDateTimeUnitTest { + private static final long timestampInMillis = 1700010123000L; + private static final String expectedTimestampString = "2023-11-15 01:02:03"; + + @Test + public void givenTimestamp_whenConvertingToLocalDateTime_thenConvertSuccessfully() { + Instant instant = Instant.ofEpochMilli(timestampInMillis); + LocalDateTime localDateTime = + LocalDateTime.ofInstant(instant, ZoneId.of("UTC")); + + DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"); + String formattedDateTime = localDateTime.format(formatter); + + assertEquals(expectedTimestampString, formattedDateTime); + } + + @Test + public void givenJodaTime_whenGettingTimestamp_thenConvertToLong() { + DateTime dateTime = new DateTime(timestampInMillis, DateTimeZone.UTC); + org.joda.time.LocalDateTime localDateTime = dateTime.toLocalDateTime(); + + org.joda.time.format.DateTimeFormatter formatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss"); + String actualTimestamp = formatter.print(localDateTime); + + assertEquals(expectedTimestampString, actualTimestamp); + } +}