Java - Convert ZonedDateTime to local and offset date, time and datetime representations

Description

Convert ZonedDateTime to local and offset date, time and datetime representations

Demo

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.Month;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;

public class Main {
  public static void main(String[] args) {
    // Get the current zoned date time for the system default time zone
    ZonedDateTime zdt1 = ZonedDateTime.now();
    System.out.println("Current zoned datetime:" + zdt1);

    // Create a local date time
    LocalDateTime ldt = LocalDateTime.of(2012, Month.MARCH, 11, 7, 30);
    // Create some zoned date times
    ZoneId usCentralZone = ZoneId.of("America/Chicago");
    ZonedDateTime zdt2 = ZonedDateTime.of(ldt, usCentralZone);
    System.out.println(zdt2);/*from w  ww  .  j a  v  a 2s .c  o m*/

    // Get zone offset and zone id
    ZoneOffset offset = zdt2.getOffset();
    ZoneId zone = zdt2.getZone();
    System.out.println("Offset:" + offset + ", Zone:" + zone);

    // Subtract 10 hours. Zone-offset changes from -05:00 to -06:00
    ZonedDateTime zdt3 = zdt2.minusHours(10);
    System.out.println(zdt3);

    // Create a date time in Asia/Kolkata time zone
    ZoneId indiaKolkataZone = ZoneId.of("Asia/Kolkata");
    ZonedDateTime zdt4 = ZonedDateTime.of(ldt, indiaKolkataZone);
    System.out.println(zdt4);

    // Perform some conversions on zoned date time
    LocalDateTime ldt2 = zdt4.toLocalDateTime();
    OffsetDateTime odt = zdt4.toOffsetDateTime();
    Instant i1 = zdt4.toInstant();
    System.out.println("To local datetime: " + ldt2);
    System.out.println("To offset datetime: " + odt);
    System.out.println("To instant: " + i1);
  }
}

Result

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