Java — How to compare Date and Time | Code Factory

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We use the DateTime API introduced in Java 8 like LocalDate, LocalTime, LocalDateTime, ZonedDateTime, as well as older classes like Date, and Calendar to demonstrate how to compare dates.

Compare dates in Java using LocalDate

package com.example.java.programming.datetime;
import java.time.LocalDate;
/**
 * @author code.factory
 *
 */
public class CompareLocalDateExample {
	public static void main(String... args) {
		LocalDate date1 = LocalDate.now();
		LocalDate date2 = LocalDate.of(2020, 6, 30);
		// isAfter() method
		if (date1.isAfter(date2)) {
			System.out.println(date1 + " is after " + date2);
		}
		// isBefore() method
		if (date1.isBefore(date2)) {
			System.out.println(date1 + " is before " + date2);
		}
		// isEqual() method
		if (date1.isEqual(date2)) {
			System.out.println(date1 + " is equal to " + date2);
		}
		// compareTo() method
		int diff = date1.compareTo(date2);
		if (diff > 0) {
			System.out.println(date1 + " is greater than " + date2);
		} else if (diff < 0) {
			System.out.println(date1 + " is less than " + date2);
		} else {
			System.out.println(date1 + " is equal to " + date2);
		}
	}
}

Output :

2020-06-29 is before 2020-06-30
2020-06-29 is less than 2020-06-30

Compare date and time in Java using LocalDateTime

package com.example.java.programming.datetime;
import java.time.LocalDateTime;
/**
 * @author code.factory
 *
 */
public class CompareLocalDateTimeExample {
	public static void main(String... args) {
		LocalDateTime date1 = LocalDateTime.now();
		LocalDateTime date2 = LocalDateTime.of(2020, 6, 30, 10, 15, 45);
		// isAfter() method
		if (date1.isAfter(date2)) {
			System.out.println(date1 + " is after " + date2);
		}
		// isBefore() method
		if (date1.isBefore(date2)) {
			System.out.println(date1 + " is before " + date2);
		}
		// isEqual() method
		if (date1.isEqual(date2)) {
			System.out.println(date1 + " is equal to " + date2);
		}
		// compareTo() method
		int diff = date1.compareTo(date2);
		if (diff > 0) {
			System.out.println(date1 + " is greater than " + date2);
		} else if (diff < 0) {
			System.out.println(date1 + " is less than " + date2);
		} else {
			System.out.println(date1 + " is equal to " + date2);
		}
	}
}

Output :

2020-06-29T17:18:22.490 is before 2020-06-30T10:15:45
2020-06-29T17:18:22.490 is less than 2020-06-30T10:15:45

Compare date and time with different TimeZones in Java using ZonedDateTime

package com.example.java.programming.datetime;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
/**
 * @author code.factory
 *
 */
public class CompareZonedDateTimeExample {
	public static void main(String... args) {
		ZonedDateTime date1 = ZonedDateTime.of(LocalDateTime.of(2020, 6, 29, 17, 30, 45), ZoneId.of("Asia/Kolkata"));
		ZonedDateTime date2 = ZonedDateTime.of(LocalDateTime.of(2020, 6, 29, 17, 30, 45), ZoneId.of("Europe/Paris"));
		// isAfter() method
		if (date1.isAfter(date2)) {
			System.out.println(date1 + " is after " + date2);
		}
		// isBefore() method
		if (date1.isBefore(date2)) {
			System.out.println(date1 + " is before " + date2);
		}
		// isEqual() method
		if (date1.isEqual(date2)) {
			System.out.println(date1 + " is equal to " + date2);
		}
		// compareTo() method
		int diff = date1.compareTo(date2);
		if (diff > 0) {
			System.out.println(date1 + " is greater than " + date2);
		} else if (diff < 0) {
			System.out.println(date1 + " is less than " + date2);
		} else {
			System.out.println(date1 + " is equal to " + date2);
		}
	}
}

Output :

2020-06-29T17:30:45+05:30[Asia/Kolkata] is before 2020-06-29T17:30:45+02:00[Europe/Paris]
2020-06-29T17:30:45+05:30[Asia/Kolkata] is less than 2020-06-29T17:30:45+02:00[Europe/Paris]

Compare time in Java using LocalTime

package com.example.java.programming.datetime;
import java.time.LocalTime;
/**
 * @author code.factory
 *
 */
public class CompareLocalTimeExample {
	public static void main(String... args) {
		LocalTime time1 = LocalTime.of(15, 20, 40);
		LocalTime time2 = LocalTime.of(10, 30, 50);
		// isAfter() method
		if (time1.isAfter(time2)) {
			System.out.println(time1 + " is after " + time2);
		}
		// isBefore() method
		if (time1.isBefore(time2)) {
			System.out.println(time1 + " is before " + time2);
		}
		// compareTo() method
		int diff = time1.compareTo(time2);
		if (diff > 0) {
			System.out.println(time1 + " is greater than " + time2);
		} else if (diff < 0) {
			System.out.println(time1 + " is less than " + time2);
		} else {
			System.out.println(time1 + " is equal to " + time2);
		}
	}
}

Output :

15:20:40 is after 10:30:50
15:20:40 is greater than 10:30:50

Compare date using Date class

package com.example.java.programming.datetime;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
 * @author code.factory
 *
 */
public class CompareDateExample {
	public static void main(String... args) throws ParseException {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		Date date1 = sdf.parse("2020-06-29 10:30:45");
		Date date2 = sdf.parse("2020-06-30 14:20:00");
		// after() method
		if (date1.after(date2)) {
			System.out.println(date1 + " is after " + date2);
		}
		// before() method
		if (date1.before(date2)) {
			System.out.println(date1 + " is before " + date2);
		}
		// equals() method
		if (date1.equals(date2)) {
			System.out.println(date1 + " is equal to " + date2);
		}
		// compareTo() method
		int diff = date1.compareTo(date2);
		if (diff > 0) {
			System.out.println(date1 + " is greater than " + date2);
		} else if (diff < 0) {
			System.out.println(date1 + " is less than " + date2);
		} else {
			System.out.println(date1 + " is equal to " + date2);
		}
	}
}

Output :

Mon Jun 29 10:30:45 IST 2020 is before Tue Jun 30 14:20:00 IST 2020
Mon Jun 29 10:30:45 IST 2020 is less than Tue Jun 30 14:20:00 IST 2020

Compare date using Calendar class

package com.example.java.programming.datetime;
import java.util.Calendar;
/**
 * @author code.factory
 *
 */
public class CompareCalendarExample {
	public static void main(String... args) {
		Calendar cal1 = Calendar.getInstance();
		cal1.set(2020, 5, 30, 10, 30, 45);
		Calendar cal2 = Calendar.getInstance();
		cal2.set(2020, 5, 29, 14, 22, 30);
		// after() method
		if (cal1.after(cal2)) {
			System.out.println(cal1.getTime() + " is after " + cal2.getTime());
		}
		// before() method
		if (cal1.before(cal2)) {
			System.out.println(cal1.getTime() + " is before " + cal2.getTime());
		}
		// equals() method
		if (cal1.equals(cal2)) {
			System.out.println(cal1.getTime() + " is equal to " + cal2.getTime());
		}
		// compareTo() method
		int diff = cal1.compareTo(cal2);
		if (diff > 0) {
			System.out.println(cal1.getTime() + " is greater than " + cal2.getTime());
		} else if (diff < 0) {
			System.out.println(cal1.getTime() + " is less than " + cal2.getTime());
		} else {
			System.out.println(cal1.getTime() + " is equal to " + cal2.getTime());
		}
	}
}

Output :

Tue Jun 30 10:30:45 IST 2020 is after Mon Jun 29 14:22:30 IST 2020
Tue Jun 30 10:30:45 IST 2020 is greater than Mon Jun 29 14:22:30 IST 2020