Java — Add/subtract years, months, days, hours, minutes, or seconds to a Date & Time | Code Factory

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Find several ways of adding or subtracting years, months, days, hours, minutes, or seconds to a Date in Java.

Add/Subtract years, months, days, hours, minutes, seconds to a Date using Calendar class

package com.example.java.programming.datetime;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
 * @author code.factory
 *
 */
public class CalendarAddSubtractExample {
	public static void main(String... args) {
		SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		Date date = new Date();
		System.out.println("Current Date : " + dateFormat.format(date));
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		c.add(Calendar.YEAR, 2);
		c.add(Calendar.MONTH, 1);
		c.add(Calendar.DATE, -2);
		c.add(Calendar.HOUR, -1);
		c.add(Calendar.MINUTE, 20);
		c.add(Calendar.SECOND, 10);
		Date currentDatePlusOne = c.getTime();
		System.out.println("Updated Date : " + dateFormat.format(currentDatePlusOne));
	}
}

Output :

Current Date : 2020-07-01 15:59:55
Updated Date : 2022-07-30 15:20:05

Add/Subtract years, months, weeks, days, hours, minutes, seconds to LocalDateTime

package com.example.java.programming.datetime;
import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;
/**
 * @author code.factory
 *
 */
public class LocalDateTimeAddSubtractExample {
	public static void main(String... args) {
		LocalDateTime dateTime = LocalDateTime.of(2020, 7, 25, 10, 30, 50);
		LocalDateTime newDateTime = dateTime.minusYears(3).plusMonths(1).minusWeeks(4).plusDays(2).minusHours(2);
		System.out.println(newDateTime);
		newDateTime = dateTime.plusYears(3).minusMonths(1).plusWeeks(4).minusDays(2).plusMinutes(30);
		System.out.println(newDateTime);
		System.out.println(dateTime.plus(2, ChronoUnit.DAYS));
	}
}

Output :

2017-07-30T08:30:50
2023-07-21T11:00:50
2020-07-27T10:30:50

Add/Subtract days, weeks, months, years to LocalDate

package com.example.java.programming.datetime;
import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
/**
 * @author code.factory
 *
 */
public class LocalDateAddSubtractExample {
	public static void main(String... args) {
		LocalDate date = LocalDate.of(2020, 07, 01);
		LocalDate newDate = date.plusYears(1).minusMonths(2).plusWeeks(3).minusDays(4);
		System.out.println(newDate);
		newDate = date.minusYears(4).plusMonths(3).minusWeeks(2).plusDays(1);
		System.out.println(newDate);
		System.out.println(date.plus(2, ChronoUnit.DAYS));
	}
}

Output :

2021-05-18
2016-09-18
2020-07-03

Add/Subtract hours, minutes, seconds to LocalTime

package com.example.java.programming.datetime;
import java.time.LocalTime;
import java.time.temporal.ChronoUnit;
/**
 * @author code.factory
 *
 */
public class LocalTimeAddSubtractExample {
	public static void main(String... args) {
		LocalTime time = LocalTime.of(11, 22, 33);
		LocalTime newTime = time.plusHours(1).plusMinutes(2).plusSeconds(3);
		System.out.println(newTime);
		LocalTime updatedTime = time.minusHours(10).minusMinutes(30).minusSeconds(50);
		System.out.println(updatedTime);
		System.out.println(time.plus(1, ChronoUnit.HOURS));
	}
}

Output :

12:24:36
00:51:43
12:22:33