The from() method of the ZoneId class used to get instance of ZoneId from TemporalAccessor object passed as parameter.This method obtains a zone based on the TemporalAccessor which represents an arbitrary set of date and time information, which this method converts to an instance of ZoneId.
Syntax:
public static ZoneId from(TemporalAccessor temporal)
Parameters: This method accepts a single parameter temporal which represents the temporal object to convert, It can’t be null.
Return value: This method returns the zone ID, which can not be null.
Exception: This method throws the DateTimeException if this method is unable to convert temporal to a ZoneId.
Below programs illustrate the from() method:
Program 1:
// Java program to demonstrate // ZoneId.from() method import java.time.*; public class GFG { public static void main(String[] args) { // create TemporalAccessor object ZonedDateTime zoneddatetime = ZonedDateTime.parse( "2018-10-25T23:12:31.123+02:00[Europe/Paris]" ); // get ZoneId from this TemporalAccessor ZoneId response = ZoneId.from(zoneddatetime); // print result System.out.println( "Zone Id got from " + "TemporalAccessor object \n" + zoneddatetime + "\nis " + response); } } |
Zone Id got from TemporalAccessor object 2018-10-25T23:12:31.123+02:00[Europe/Paris] is Europe/Paris
Program 2:
// Java program to demonstrate // ZoneId.from() method import java.time.*; public class GFG { public static void main(String[] args) { // create TemporalAccessor object ZonedDateTime zoneddatetime = ZonedDateTime.now(); // get ZoneId from this TemporalAccessor ZoneId response = ZoneId.from(zoneddatetime); // print result System.out.println( "Zone Id got from " + "TemporalAccessor object \n" + zoneddatetime + "\nis " + response); } } |
Zone Id got from TemporalAccessor object 2018-12-10T18:20:03.637Z[Etc/UTC] is Etc/UTC
References:
https://docs.oracle.com/javase/10/docs/api/java/time/ZoneId.html#from(java.lang.Object)