Time Difference Using Java 8!
// {...}
ZoneId singaporeZone = ZoneId.of("Asia/Singapore");
ZonedDateTime dateTimeInSingapore =
ZonedDateTime.of(LocalDateTime.of(2016,Month.JANUARY,1,6,0), singaporeZone);
ZoneId aucklandZone = ZoneId.of("Pacific/Auckland");
ZonedDateTime dateTimeinAuckland =
dateTimeInSingapore.withZoneSameInstant(aucklandZone);
Duration timeDifference = Duration.between(
dateTimeInSingapore.toLocalTime(), dateTimeinAuckland.toLocalTime());
System.out.printf("Time difference between %s and %s zone is %d hours", singaporeZone,aucklandZone,timeDifference.toHours());
//{...}
Advanced usage
If you want a more complex example (external libraries, viewers...), use the Advanced Java template
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