/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.time.* ;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
// Do not use `Temporal`. Use the concrete classes, per design of java.time.
 
// Represent the person’s birth-moment.
LocalDate ld = LocalDate.of( 2000 , Month.JANUARY , 23 ) ;
LocalTime lt = LocalTime.of( 3 , 45 ) ;
ZoneId z = ZoneId.of( "Pacific/Auckland" ) ;
ZonedDateTime zdt = ZonedDateTime.of( ld , lt , z ) ;
 
// Adjust to UTC, if you care to.
Instant instant = zdt.toInstant() ;
 
// Define the billions seconds as a `Duration`, a span of time unattached to the timeline.
Duration d = Duration.ofSeconds( 1_000_000_000L ) ;  
 
// Addition.
ZonedDateTime zdtLater = zdt.plus( d ) ;
 
// Or, in UTC. Same moment as the `ZonedDateTime` but different wall-clock time.
Instant instantLater = instant.plus( d ) ;
 
System.out.println( "zdt.toString(): " + zdt ) ;
System.out.println( "instant.toString(): " + instant ) ;
System.out.println( "d.toString(): " + d ) ;
System.out.println( "zdtLater.toString(): " + zdtLater ) ;
System.out.println( "instantLater.toString(): " + instantLater ) ;
 
	}
}

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