JAVA EE: How to add year, month, day, hour etc to the date and time using plus methods of LocalDateTime Class

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LocalDateTimeDemo.java

import java.time.LocalDateTime;

public class LocalDateTimeDemo

{

    public static void main(String[] args)

    {

        LocalDateTime localDateTime1 = LocalDateTime.now();

        System.out.println("Current date and Time = "+localDateTime1);

        LocalDateTime localDateTime2 = localDateTime1.plusYears(2);

        System.out.println("\nYear changed          = "+localDateTime2);

        LocalDateTime localDateTime3 = localDateTime2.plusMonths(3);

        System.out.println("Month changed         = "+localDateTime3);

        LocalDateTime localDateTime4 = localDateTime3.plusDays(5);

        System.out.println("Day changed           = "+localDateTime4);

        LocalDateTime localDateTime5 = localDateTime4.plusHours(1);

        System.out.println("Hour changed          = "+localDateTime5);

        LocalDateTime localDateTime6 = localDateTime5.plusMinutes(10);

        System.out.println("Min changed           = "+localDateTime6);

        LocalDateTime localDateTime7 = localDateTime6.plusSeconds(20);

        System.out.println("Sec changed           = "+localDateTime7);

        LocalDateTime localDateTime8 = localDateTime7.plusNanos(50);

        System.out.println("NanoSec changed       = "+localDateTime8);

        LocalDateTime localDateTime9 = localDateTime8.plusWeeks(3);

        System.out.println("Week changed          = "+localDateTime9);

    }

}

Output

Current date and Time = 2018-01-15T09:07:10.128

Year changed          = 2020-01-15T09:07:10.128

Month changed         = 2020-04-15T09:07:10.128

Day changed           = 2020-04-20T09:07:10.128

Hour changed          = 2020-04-20T10:07:10.128

Min changed           = 2020-04-20T10:17:10.128

Sec changed           = 2020-04-20T10:17:30.128

NanoSec changed       = 2020-04-20T10:17:30.128000050

Week changed          = 2020-05-11T10:17:30.128000050