Bash: get date and time from another time zone

Question

I would want to get the date and time from another time zone (UTC-4) with a bash command, but I don't want to configure it as the default TZ for the system.
Is there a simple way to do it?
E.g 1 (current):

$ date
fri nov  7 13:15:35 UTC 2014

E.g 2 (what I need):

$ date (+ some option for UTC-4)
fri nov  7 09:15:35 UTC 2014

Answer 1

You can use offset value in TZ to get the date for a different timezone:

TZ=UTC date -R
Fri, 07 Nov 2014 13:55:07 +0000

TZ=UTC+4 date -R
Fri, 07 Nov 2014 09:54:52 -0400

Answer 2

You could use

TZ=America/New_York date

or if you want to do date arithmetic you could use

date -d "+5 hours"

Answer 3

If the other solutioons don't work, use

date --date='TZ="UTC+4" 2016-08-22 10:37:44' "+%Y-%m-%d %H:%M:%S"

2016-08-22 16:37:44