BAEL-3375 Working with Dates before Java 8

core-java-modules/core-java-date-operations/pom.xml

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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>

core-java-modules/core-java-date-operations/src/main/java/com/baeldung/sql/DateUtils.java

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+package com.baeldung.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());
+    }
+}

core-java-modules/core-java-date-operations/src/main/java/com/baeldung/sql/TimeUtils.java

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+package com.baeldung.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());
+    }
+}

core-java-modules/core-java-date-operations/src/main/java/com/baeldung/sql/TimestampUtils.java

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+package com.baeldung.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());
+    }
+}

core-java-modules/core-java-date-operations/src/test/java/com/baeldung/sql/DateUtilsUnitTest.java

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+package com.baeldung.sql;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+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"));
+    }
+}

core-java-modules/core-java-date-operations/src/test/java/com/baeldung/sql/TimeUtilsUnitTest.java

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+package com.baeldung.sql;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+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"));
+    }
+}

core-java-modules/core-java-date-operations/src/test/java/com/baeldung/sql/TimestampUtilsUnitTest.java

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+package com.baeldung.sql;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import java.text.ParseException;
+import java.util.Date;
+
+public class TimestampUtilsUnitTest {
+
+    @Test
+    public void givenCurrentTimestamp_thenNowIsReturned() {
+        assertEquals(TimestampUtils.getNow().toInstant(), new Date().toInstant());
+    }
+
+    @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"));
+    }
+}