These come in handy as I frequently need to know the time in different timezone.
To get the current time in a different timezone, specify the TZ variable
$ TZ=US/Pacific date
Thu Jan 8 17:57:08 PST 2015
To get the time of your choice
$ date –date=’TZ=”US/Pacific” 01:00′
Fri Jan 9 17:00:00 HKT 2015