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BAEL-6357: Convert Long to Date in Java (#15691) 

Co-authored-by: Luis Javier Peris Morillo <javierperis@gmail.com>
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Azhwani 2024-01-26 18:03:11 +01:00 committed by GitHub
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3 changed files with 76 additions and 2 deletions
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1
core-java-modules/core-java-date-operations-4/README.md
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@ -3,4 +3,3 @@ This module contains articles about date operations in Java.
### Relevant Articles:

3
core-java-modules/core-java-date-operations-4/pom.xml
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@ -5,6 +5,7 @@
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-date-operations-4</artifactId>
<name>core-java-date-operations-4</name>
<build>
<plugins>
<plugin>
@ -39,7 +40,7 @@
</dependencies>
<properties>
<joda-time.version>2.12.5</joda-time.version>
<joda-time.version>2.12.6</joda-time.version>
</properties>
</project>

74
core-java-modules/core-java-date-operations-4/src/test/java/com/baeldung/longtodate/LongToDateUnitTest.java Normal file
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@ -0,0 +1,74 @@
package com.baeldung.longtodate;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
import org.joda.time.DateTimeZone;
import org.joda.time.Instant;
import org.junit.jupiter.api.Test;
class LongToDateUnitTest {
@Test
void givenLongValue_whenUsingInstantClass_thenConvert() {
Instant expectedDate = Instant.parse("2020-09-08T12:16:40Z");
long seconds = 1599567400L;
Instant date = Instant.ofEpochSecond(seconds);
assertEquals(expectedDate, date);
}
@Test
void givenLongValue_whenUsingLocalDateClass_thenConvert() {
LocalDate expectedDate = LocalDate.of(2023, 10, 17);
long epochDay = 19647L;
LocalDate date = LocalDate.ofEpochDay(epochDay);
assertEquals(expectedDate, date);
}
@Test
void givenLongValue_whenUsingDateClass_thenConvert() throws ParseException {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
Date expectedDate = dateFormat.parse("2023-07-15 22:00:00");
long milliseconds = 1689458400000L;
Date date = new Date(milliseconds);
assertEquals(expectedDate, date);
}
@Test
void givenLongValue_whenUsingCalendarClass_thenConvert() throws ParseException {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
Date expectedDate = dateFormat.parse("2023-07-15 22:00:00");
long milliseconds = 1689458400000L;
Calendar calendar = Calendar.getInstance();
calendar.setTimeZone(TimeZone.getTimeZone("UTC"));
calendar.setTimeInMillis(milliseconds);
assertEquals(expectedDate, calendar.getTime());
}
@Test
void givenLongValue_whenUsingJodaTimeLocalDateClass_thenConvert() {
org.joda.time.LocalDate expectedDate = new org.joda.time.LocalDate(2023, 7, 15);
long milliseconds = 1689458400000L;
org.joda.time.LocalDate date = new org.joda.time.LocalDate(milliseconds, DateTimeZone.UTC);
assertEquals(expectedDate, date);
}
}