/* 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
	{
 
ZoneId z = ZoneId.of( "Pacific/Auckland" ) ;
LocalDate ld = LocalDate.of( 2021 , Month.SEPTEMBER , 26 ) ;
ZonedDateTime zdtStart = ld.atStartOfDay( z ) ;
Instant instantStart = zdtStart.toInstant() ;
long start = instantStart.getEpochSecond() ;
 
LocalDate nextDay = ld.plusDays( 1 ) ;
ZonedDateTime zdtEnd = nextDay.atStartOfDay( z ) ;
Instant instantEnd = zdtEnd.toInstant() ;
long end = instantEnd.getEpochSecond() ;
 
Duration d = Duration.between( zdtStart , zdtEnd ) ;  // 23 hours, not 24, for Daylight Saving Time (DST) cut-over on that date in that zone.
 
System.out.println( zdtStart + "/" + zdtEnd ) ;
System.out.println( d ) ;
System.out.println( instantStart + "/" + instantEnd ) ;
System.out.println( start + "/" + end ) ;
 
	}
}

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