/* 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 start = LocalDateTime
        .parse( "2017-10-28T15:00:00" )
        .atZone( ZoneId.of( "Europe/Berlin" ) ) ;  // Producing a `ZonedDateTime` instance. 
 
ZonedDateTime stop = LocalDateTime
        .parse( "2017-10-29T03:00:00" )
        .atZone( ZoneId.of( "Europe/Berlin" ) ) ; // Producing another `ZonedDateTime` instance. 
 
long hours = ChronoUnit.HOURS.between(  start ,  stop ) ;
 
System.out.println( "start.toString(): " +  start ) ;
System.out.println( "stop.toString(): " +  stop ) ;
System.out.println( "hours: " +  hours ) ;
 
	}
}

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