JAVA EE: How to subtract year, month etc from current date and time using minus methods of ZonedDateTime

Tuesday 20 February 2018

How to subtract year, month etc from current date and time using minus methods of ZonedDateTime

Click here to watch on Youtube :
https://www.youtube.com/watch?v=Hl6Rue3K2bU&list=UUhwKlOVR041tngjerWxVccw

ZoneDateTimeDemo.java

import java.time.ZonedDateTime;

public class ZoneDateTimeDemo

{

    public static void main(String[] args)

    {

        /*
         * Returns:the current date-time using the system clock, not
         * null.
         */

        ZonedDateTime zonedDateTime1 = ZonedDateTime.now();

        System.out.println("Current date and time = " + zonedDateTime1);

        ZonedDateTime zonedDateTime2 = zonedDateTime1.minusYears(2);

        System.out.println("\nYear changed          = " + zonedDateTime2);

        ZonedDateTime zonedDateTime3 = zonedDateTime2.minusMonths(3);

        System.out.println("Month changed         = " + zonedDateTime3);

        ZonedDateTime zonedDateTime4 = zonedDateTime3.minusDays(5);

        System.out.println("Day changed           = " + zonedDateTime4);

        ZonedDateTime zonedDateTime5 = zonedDateTime4.minusHours(1);

        System.out.println("Hour changed          = " + zonedDateTime5);

        ZonedDateTime zonedDateTime6 = zonedDateTime5.minusMinutes(10);

        System.out.println("Min changed           = " + zonedDateTime6);

        ZonedDateTime zonedDateTime7 = zonedDateTime6.minusSeconds(20);

        System.out.println("Sec changed           = " + zonedDateTime7);

        ZonedDateTime zonedDateTime8 = zonedDateTime7.minusNanos(50);

        System.out.println("NanoSec changed       = " + zonedDateTime8);

        ZonedDateTime zonedDateTime9 = zonedDateTime8.minusWeeks(3);

        System.out.println("Week changed          = " + zonedDateTime9);

    }

}

Output

Current date and time = 2018-02-05T10:11:57.559+05:30[Asia/Calcutta]

Year changed          = 2016-02-05T10:11:57.559+05:30[Asia/Calcutta]

Month changed         = 2015-11-05T10:11:57.559+05:30[Asia/Calcutta]

Day changed           = 2015-10-31T10:11:57.559+05:30[Asia/Calcutta]

Hour changed          = 2015-10-31T09:11:57.559+05:30[Asia/Calcutta]

Min changed           = 2015-10-31T09:01:57.559+05:30[Asia/Calcutta]

Sec changed           = 2015-10-31T09:01:37.559+05:30[Asia/Calcutta]

NanoSec changed       = 2015-10-31T09:01:37.558999950+05:30[Asia/Calcutta]

Week changed          = 2015-10-10T09:01:37.558999950+05:30[Asia/Calcutta]