Combines this date-time with a time-zone to create a new instance of ZonedDateTime, adjusting date/time to ensure that the result has the same 'instant'.
This conversion uses underlying 'instant' for desire conversion instead of local date/time fields.
package com.logicbig.example.offsetdatetime;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
public class AtZoneSameInstantExample {
public static void main (String... args) {
OffsetDateTime d = OffsetDateTime.of(2016, 10, 20,
11, 12, 30, 1000,
ZoneOffset.ofHours(-6));
ZonedDateTime z = d.atZoneSameInstant(ZoneId.of("Asia/Seoul"));
System.out.println(z);
}
}
Output
2016-10-21T02:12:30.000001+09:00[Asia/Seoul]
This example demonstrates that atZoneSameInstant adjusts the DST (Daylight saving time) differences to the resultant target ZoneId.
Offset -5 represents USA central region (CST) during DST and offset -6 also represents the same region but outside of DST. Notice the resultant Offset of Asia/Seoul adjusted by one hour. Before DST the gap between the two was 14 hours and after DST it became 15 hours.
package com.logicbig.example.offsetdatetime;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
public class AtZoneSameInstantExample2 {
public static void main (String... args) {
OffsetDateTime d = OffsetDateTime.of(2016, 11, 6,
0, 20, 30, 1000,
ZoneOffset.ofHours(-5));
System.out.printf("Original OffSetDateTime in DST: %s%n", d);
ZonedDateTime z = d.atZoneSameInstant(ZoneId.of("Asia/Seoul"));
System.out.printf("atZoneSameInstant: %s%n", z);
d = OffsetDateTime.of(2016, 11, 6,
4, 20, 30, 1000,
ZoneOffset.ofHours(-6));
System.out.printf("Original OffSetDateTime after DST: %s%n", d);
z = d.atZoneSameInstant(ZoneId.of("Asia/Seoul"));
System.out.printf("atZoneSameInstant: %s%n", z);
}
}
Output
Original OffSetDateTime in DST: 2016-11-06T00:20:30.000001-05:00
atZoneSameInstant: 2016-11-06T14:20:30.000001+09:00[Asia/Seoul]
Original OffSetDateTime after DST: 2016-11-06T04:20:30.000001-06:00
atZoneSameInstant: 2016-11-06T19:20:30.000001+09:00[Asia/Seoul]
