/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.time.*;
import java.time.temporal.*;
import java.time.format.*;
 
/* 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
	{
		// ZonedDateTime
		LocalDate ld = LocalDate.of( 2017 , Month.MARCH , 12 ) ;
		LocalTime lt = LocalTime.of( 1 , 0 ) ;
		ZoneId z = ZoneId.of( "America/New_York" ) ;
		ZonedDateTime zdt = ZonedDateTime.of( ld , lt , z ) ;
		ZonedDateTime zdtOneHourLater = zdt.plusHours( 1 ) ;
 
		System.out.println( "zdt: " + zdt ) ;
		System.out.println( "zdtOneHourLater: " + zdtOneHourLater ) ; 
		System.out.println( "Yikes! 1 AM plus an hour is 3 AM? Yes, that is an anomaly known as Daylight Saving Time (DST)." ) ;
		System.out.println( "" ) ;
 
		// Instant
		Instant instant = zdt.toInstant() ;  // Adjust into UTC. Same moment, same point on the timeline, but viewed by a different wall-clock.
		Instant instantOneHourLater = instant.plus( 1 , ChronoUnit.HOURS ) ;
 
		System.out.println( "instant: " + instant ) ;
		System.out.println( "instantOneHourLater: " + instantOneHourLater ) ;  
		System.out.println( "Instant is always in UTC. So no anomalies, no DST. Adding an hour to 1 AM results in 2 AM every time." ) ;
	}
}

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