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Merge pull request #8141 from JonCook/master 

BAEL-3375 - Get the current Date in Java (non Java 8)
This commit is contained in:
Jonathan Cook 2019-11-04 18:18:04 +01:00 committed by GitHub
parent 910c7daf2a c903bbbe18
commit cdeb947e42
12 changed files with 247 additions and 0 deletions
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17
core-java-modules/core-java-date-operations/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<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>core-java-date-operations</artifactId>
<version>${project.parent.version}</version>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath>
</parent>
</project>

15
core-java-modules/core-java-date-operations/src/main/java/com/baeldung/datetime/CalendarUtils.java Normal file
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package com.baeldung.datetime;
import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;
public class CalendarUtils {
public static Calendar getPlusDays(Date date, int amount) throws ParseException {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.DAY_OF_YEAR, amount);
return calendar;
}
}

20
core-java-modules/core-java-date-operations/src/main/java/com/baeldung/datetime/DateUtils.java Normal file
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package com.baeldung.datetime;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class DateUtils {
public static Date getNow() {
return new Date();
}
public static Date getDate(long millis) {
return new Date(millis);
}
public static Date getDate(String dateAsString, String pattern) throws ParseException {
return new SimpleDateFormat(pattern).parse(dateAsString);
}
}

21
core-java-modules/core-java-date-operations/src/main/java/com/baeldung/datetime/sql/DateUtils.java Normal file
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package com.baeldung.datetime.sql;
import java.sql.Date;
import java.text.ParseException;
import java.text.SimpleDateFormat;
public class DateUtils {
public static Date getNow() {
return new Date(System.currentTimeMillis());
}
public static Date getDate(String dateAsString) {
return Date.valueOf(dateAsString);
}
public static Date getDate(String dateAsString, String pattern) throws ParseException {
java.util.Date customUtilDate = new SimpleDateFormat(pattern).parse(dateAsString);
return new Date(customUtilDate.getTime());
}
}

21
core-java-modules/core-java-date-operations/src/main/java/com/baeldung/datetime/sql/TimeUtils.java Normal file
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package com.baeldung.datetime.sql;
import java.sql.Time;
import java.text.ParseException;
import java.text.SimpleDateFormat;
public class TimeUtils {
public static Time getNow() {
return new Time(System.currentTimeMillis());
}
public static Time getTime(String timeAsString) {
return Time.valueOf(timeAsString);
}
public static Time getTime(String dateAsString, String pattern) throws ParseException {
java.util.Date customUtilDate = new SimpleDateFormat(pattern).parse(dateAsString);
return new Time(customUtilDate.getTime());
}
}

21
core-java-modules/core-java-date-operations/src/main/java/com/baeldung/datetime/sql/TimestampUtils.java Normal file
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package com.baeldung.datetime.sql;
import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
public class TimestampUtils {
public static Timestamp getNow() {
return new Timestamp(System.currentTimeMillis());
}
public static Timestamp getTimestamp(String timestampAsString) {
return Timestamp.valueOf(timestampAsString);
}
public static Timestamp getTimestamp(String dateAsString, String pattern) throws ParseException {
java.util.Date customUtilDate = new SimpleDateFormat(pattern).parse(dateAsString);
return new Timestamp(customUtilDate.getTime());
}
}

21
core-java-modules/core-java-date-operations/src/test/java/com/baeldung/datetime/CalendarUtilsUnitTest.java Normal file
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package com.baeldung.datetime;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import com.baeldung.datetime.CalendarUtils;
import com.baeldung.datetime.DateUtils;
import java.text.ParseException;
import java.util.Date;
public class CalendarUtilsUnitTest {
@Test
public void givenDateAndDaysToAdd_thenCalendarIsCorrectlyReturned() throws ParseException {
Date initialDate = DateUtils.getDate("2020/01/01", "yyyy/MM/dd");
Date expectedDate= DateUtils.getDate("2020/01/11", "yyyy/MM/dd");
assertEquals(expectedDate, CalendarUtils.getPlusDays(initialDate, 10).getTime());
}
}

25
core-java-modules/core-java-date-operations/src/test/java/com/baeldung/datetime/DateUtilsUnitTest.java Normal file
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package com.baeldung.datetime;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import com.baeldung.datetime.DateUtils;
import java.text.ParseException;
import java.util.Date;
public class DateUtilsUnitTest {
@Test
public void givenTimeMillis_thenDateIsReturned() {
Date now = DateUtils.getNow();
assertEquals(DateUtils.getDate(now.getTime()), now);
}
@Test
public void givenDateAndPattern_thenDateIsCorrectlyReturned() throws ParseException {
long milliseconds = new Date(2020 - 1900, 0, 1).getTime();
assertEquals(DateUtils.getDate(milliseconds), DateUtils.getDate("2020/01/01", "yyyy/MM/dd"));
}
}

28
core-java-modules/core-java-date-operations/src/test/java/com/baeldung/datetime/sql/DateUtilsUnitTest.java Normal file
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package com.baeldung.datetime.sql;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import com.baeldung.datetime.sql.DateUtils;
import java.text.ParseException;
import java.util.Date;
public class DateUtilsUnitTest {
@Test
public void givenCurrentDate_thenTodayIsReturned() {
assertEquals(DateUtils.getNow(), new Date());
}
@Test(expected = IllegalArgumentException.class)
public void givenDateAsString_whenPatternIsNotRespected_thenExceptionIsThrown() {
DateUtils.getDate("2020 01 01");
}
@Test
public void givenDateAndPattern_thenDateIsCorrectlyReturned() throws ParseException {
assertEquals(DateUtils.getDate("2020-01-01"), DateUtils.getDate("2020/01/01", "yyyy/MM/dd"));
}
}

28
core-java-modules/core-java-date-operations/src/test/java/com/baeldung/datetime/sql/TimeUtilsUnitTest.java Normal file
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package com.baeldung.datetime.sql;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import com.baeldung.datetime.sql.TimeUtils;
import java.text.ParseException;
import java.util.Date;
public class TimeUtilsUnitTest {
@Test
public void givenCurrentTime_thenNowIsReturned() {
assertEquals(TimeUtils.getNow(), new Date());
}
@Test(expected = IllegalArgumentException.class)
public void givenTimeAsString_whenPatternIsNotRespected_thenExceptionIsThrown() {
TimeUtils.getTime("10 11 12");
}
@Test
public void givenTimeAndPattern_thenTimeIsCorrectlyReturned() throws ParseException {
assertEquals(TimeUtils.getTime("10:11:12"), TimeUtils.getTime("10 11 12", "hh mm ss"));
}
}

29
core-java-modules/core-java-date-operations/src/test/java/com/baeldung/datetime/sql/TimestampUtilsUnitTest.java Normal file
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package com.baeldung.datetime.sql;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import com.baeldung.datetime.sql.TimestampUtils;
import java.text.ParseException;
import java.util.Date;
public class TimestampUtilsUnitTest {
@Test
public void givenCurrentTimestamp_thenNowIsReturned() {
assertEquals(TimestampUtils.getNow()
.getTime(), new Date().getTime());
}
@Test(expected = IllegalArgumentException.class)
public void givenTimestampAsString_whenPatternIsNotRespected_thenExceptionIsThrown() {
TimestampUtils.getTimestamp("2020/01/01 10:11-12");
}
@Test
public void givenTimestampAndPattern_thenTimestampIsCorrectlyReturned() throws ParseException {
assertEquals(TimestampUtils.getTimestamp("2020-01-01 10:11:12"), TimestampUtils.getTimestamp("2020/01/01 10:11-12", "yyyy/MM/dd hh:mm-ss"));
}
}

1
core-java-modules/pom.xml
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@ -19,6 +19,7 @@
<module>core-java-lang-operators</module>
<module>core-java-networking-2</module>
<module>core-java-security-manager</module>
<module>core-java-date-operations</module>
</modules>
</project>