JAVA EE: How to set year, month, hour etc of date and time using with methods of ZonedDateTime Class

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ZoneDateTimeDemo.java

import java.time.ZonedDateTime;

public class ZoneDateTimeDemo

{

    public static void main(String[] args)

    {

        ZonedDateTime zonedDateTime1 = ZonedDateTime.parse("2017-02-03T10:15:30+01:00");

        System.out.println("zonedDateTime1        = "+zonedDateTime1);

        ZonedDateTime zonedDateTime2 = zonedDateTime1.withYear(2018);

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

        ZonedDateTime zonedDateTime3 = zonedDateTime2.withMonth(10);

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

        ZonedDateTime zonedDateTime4 = zonedDateTime3.withDayOfMonth(25);

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

        ZonedDateTime zonedDateTime5 = zonedDateTime4.withHour(1);

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

        ZonedDateTime zonedDateTime6 = zonedDateTime5.withMinute(10);

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

        ZonedDateTime zonedDateTime7 = zonedDateTime6.withSecond(20);

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

        ZonedDateTime zonedDateTime8 = zonedDateTime7.withNano(50);

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

    }

}

Output

zonedDateTime1        = 2017-02-03T10:15:30+01:00

Year changed          = 2018-02-03T10:15:30+01:00

Month changed         = 2018-10-03T10:15:30+01:00

Day changed           = 2018-10-25T10:15:30+01:00

Hour changed          = 2018-10-25T01:15:30+01:00

Min changed           = 2018-10-25T01:10:30+01:00

Sec changed           = 2018-10-25T01:10:20+01:00

NanoSec changed       = 2018-10-25T01:10:20.000000050+01:00