The withZoneSameInstant() method of a ChronoZonedDateTime interface used to return a copy of this ChronoZonedDateTime object by changing the time-zone and without the instant.This method is based on retaining the same instant, thus gaps and overlaps in the local time-line have no effect on the result.
Syntax:
ChronoZonedDateTime withZoneSameInstant(ZoneId zone)
Parameters: This method accepts one single parameter zone the time-zone to change to.It should not be null.
Return value: This method returns a ChronoZonedDateTime based on this date-time with the requested zone.
Exception: This method throws DateTimeException: if the result exceeds the supported date range.
Below programs illustrate the withZoneSameInstant() method:
Program 1:
// Java program to demonstrate// ChronoZonedDateTime.withZoneSameInstant() method  import java.time.*;import java.time.chrono.*;  public class GFG {    public static void main(String[] args)    {          // create a ChronoZonedDateTime object        ChronoZonedDateTime zonedDT            = ZonedDateTime                  .parse(                      "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]");          // print ChronoZonedDateTime        System.out.println("ChronoZonedDateTime of Calcutta: "                           + zonedDT);          // apply withZoneSameInstant()        ChronoZonedDateTime zonedDT2            = zonedDT                  .withZoneSameInstant(                      ZoneId.of("Pacific/Fiji"));          // print ChronoZonedDateTime after withZoneSameInstant()        System.out.println("ChronoZonedDateTime of Fuji: "                           + zonedDT2);    }} |
Output:
ChronoZonedDateTime of Calcutta: 2018-12-06T19:21:12.123+05:30[Asia/Calcutta] ChronoZonedDateTime of Fuji: 2018-12-07T02:51:12.123+13:00[Pacific/Fiji]
Program 2:
// Java program to demonstrate// ChronoZonedDateTime.withZoneSameInstant() method  import java.time.*;import java.time.chrono.*;  public class GFG {    public static void main(String[] args)    {          // create a ChronoZonedDateTime object        ChronoZonedDateTime zonedDT            = ZonedDateTime                  .parse(                      "2018-10-25T23:12:31.123+02:00[Europe/Paris]");          // print ChronoZonedDateTime        System.out.println("ChronoZonedDateTime of Calcutta: "                           + zonedDT);          // apply withZoneSameInstant()        ChronoZonedDateTime zonedDT2            = zonedDT                  .withZoneSameInstant(                      ZoneId.of("Canada/Yukon"));          // print ChronoZonedDateTime after withZoneSameInstant()        System.out.println("ChronoZonedDateTime of yukon: "                           + zonedDT2);    }} |
Output:
ChronoZonedDateTime of Calcutta: 2018-10-25T23:12:31.123+02:00[Europe/Paris] ChronoZonedDateTime of yukon: 2018-10-25T14:12:31.123-07:00[Canada/Yukon]
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