Convert between LocalDateTime and ZonedDateTime

Learn to convert the LocalDateTime to ZonedDateTime, and vice versa using easy-to-understand Java examples.

An instance of LocalDateTime represents a date-time (to nanosecond precision.) without a time-zone in the ISO-8601 calendar system. A LocalDateTime instance represents a point in the local timeline. It cannot represent an instant on the universal timeline without additional information such as an offset or time zone.

A ZonedDateTime instance represents an instant in the universal timeline. It is the combination of date, time and zone information.

1. LocalDateTime -> ZonedDateTime

To convert from LocalDateTime to ZonedDateTime, we must add the zone offset to the local date-time. Whatever the zone information we will add, the constructed object will represent an instant in the universal timeline with the configured offset.

ZonedDateTime = LocalDateTime + ZoneId

LocalDateTime ldt = LocalDateTime.now(); //Local date time

ZoneId zoneId = ZoneId.of( "Asia/Kolkata" );  //Zone information

ZonedDateTime zdtAtAsia = ldt.atZone( zoneId );	//Local time in Asia timezone

ZonedDateTime zdtAtET = zdtAtAsia
    .withZoneSameInstant( ZoneId.of( "America/New_York" ) ); //Sama time in ET timezone

Program Output:

2018-07-15T11:27:46.203763100+05:30[Asia/Kolkata]
2018-07-15T01:57:46.203763100-04:00[America/New_York]

2. ZonedDateTime -> LocalDateTime

Use ZonedDateTime.toLocalDateTime() method to get local datetime without timezone information.

ZonedDateTime zdtAtET = ZonedDateTime.now(ZoneId.of("America/New_York"));

LocalDateTime ldt = zdtAtET.toLocalDateTime();

System.out.println(zdtAtET);
System.out.println(ldt);

Program Output:

2018-07-15T01:59:52.054839900-04:00[America/New_York]
2018-07-15T01:59:52.054839900

Happy Learning !!

Sourcecode on Github

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