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#BAEL-16646 move https://www.baeldung.com/java-date-difference in new module java-dates-computations

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This commit is contained in:
Alessio Stalla
2019-09-29 11:13:08 +02:00
parent f59fa07851
commit 491a912090
7 changed files with 68 additions and 8 deletions
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6
core-java-modules/core-java-datetime/java-dates-computations/README.md Normal file
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## Java Date/time computations Cookbooks and Examples
This module contains articles about date and time computations in Java.
### Relevant Articles:
- [Difference Between Two Dates in Java](http://www.baeldung.com/java-date-difference)

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core-java-modules/core-java-datetime/java-dates-computations/pom.xml Normal file
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>java-dates-computations</artifactId>
<version>${project.parent.version}</version>
<name>java-dates-computations</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../../parent-java</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>${joda-time.version}</version>
</dependency>
<dependency>
<groupId>com.darwinsys</groupId>
<artifactId>hirondelle-date4j</artifactId>
<version>RELEASE</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>java-dates-computations</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<joda-time.version>2.10</joda-time.version>
<!-- testing -->
<assertj.version>3.6.1</assertj.version>
<maven.compiler.source>1.9</maven.compiler.source>
<maven.compiler.target>1.9</maven.compiler.target>
</properties>
</project>

115
core-java-modules/core-java-datetime/java-dates-computations/src/test/java/com/baeldung/date/DateDiffUnitTest.java Normal file
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package com.baeldung.date;
import org.junit.Test;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Duration;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.Period;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.temporal.ChronoUnit;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;
import static org.junit.Assert.assertEquals;
public class DateDiffUnitTest {
@Test
public void givenTwoDatesBeforeJava8_whenDifferentiating_thenWeGetSix() throws ParseException {
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy", Locale.ENGLISH);
Date firstDate = sdf.parse("06/24/2017");
Date secondDate = sdf.parse("06/30/2017");
long diffInMillies = Math.abs(secondDate.getTime() - firstDate.getTime());
long diff = TimeUnit.DAYS.convert(diffInMillies, TimeUnit.MILLISECONDS);
assertEquals(diff, 6);
}
@Test
public void givenTwoDatesInJava8_whenDifferentiating_thenWeGetSix() {
LocalDate now = LocalDate.now();
LocalDate sixDaysBehind = now.minusDays(6);
Period period = Period.between(now, sixDaysBehind);
int diff = period.getDays();
assertEquals(diff, 6);
}
@Test
public void givenTwoDateTimesInJava8_whenDifferentiating_thenWeGetSix() {
LocalDateTime now = LocalDateTime.now();
LocalDateTime sixMinutesBehind = now.minusMinutes(6);
Duration duration = Duration.between(now, sixMinutesBehind);
long diff = Math.abs(duration.toMinutes());
assertEquals(diff, 6);
}
@Test
public void givenTwoDateTimesInJava8_whenDifferentiatingInSeconds_thenWeGetTen() {
LocalDateTime now = LocalDateTime.now();
LocalDateTime tenSecondsLater = now.plusSeconds(10);
long diff = ChronoUnit.SECONDS.between(now, tenSecondsLater);
assertEquals(diff, 10);
}
@Test
public void givenTwoZonedDateTimesInJava8_whenDifferentiating_thenWeGetSix() {
LocalDateTime ldt = LocalDateTime.now();
ZonedDateTime now = ldt.atZone(ZoneId.of("America/Montreal"));
ZonedDateTime sixDaysBehind = now.withZoneSameInstant(ZoneId.of("Asia/Singapore")).minusDays(6);
long diff = ChronoUnit.DAYS.between(sixDaysBehind, now);
assertEquals(diff, 6);
}
@Test
public void givenTwoDateTimesInJava8_whenDifferentiatingInSecondsUsingUntil_thenWeGetTen() {
LocalDateTime now = LocalDateTime.now();
LocalDateTime tenSecondsLater = now.plusSeconds(10);
long diff = now.until(tenSecondsLater, ChronoUnit.SECONDS);
assertEquals(diff, 10);
}
@Test
public void givenTwoDatesInJodaTime_whenDifferentiating_thenWeGetSix() {
org.joda.time.LocalDate now = org.joda.time.LocalDate.now();
org.joda.time.LocalDate sixDaysBehind = now.minusDays(6);
org.joda.time.Period period = new org.joda.time.Period(now, sixDaysBehind);
long diff = Math.abs(period.getDays());
assertEquals(diff, 6);
}
@Test
public void givenTwoDateTimesInJodaTime_whenDifferentiating_thenWeGetSix() {
org.joda.time.LocalDateTime now = org.joda.time.LocalDateTime.now();
org.joda.time.LocalDateTime sixMinutesBehind = now.minusMinutes(6);
org.joda.time.Period period = new org.joda.time.Period(now, sixMinutesBehind);
long diff = Math.abs(period.getDays());
}
@Test
public void givenTwoDatesInDate4j_whenDifferentiating_thenWeGetSix() {
hirondelle.date4j.DateTime now = hirondelle.date4j.DateTime.now(TimeZone.getDefault());
hirondelle.date4j.DateTime sixDaysBehind = now.minusDays(6);
long diff = Math.abs(now.numDaysFrom(sixDaysBehind));
assertEquals(diff, 6);
}
}