$ tzselect
Please identify a location so that time zone rules can be set correctly.
Please select a continent, ocean, "coord", or "TZ".
 1) Africa
 2) Americas
 3) Antarctica
 4) Arctic Ocean
 5) Asia
 6) Atlantic Ocean
 7) Australia
 8) Europe
 9) Indian Ocean
10) Pacific Ocean
11) coord - I want to use geographical coordinates.
12) TZ - I want to specify the time zone using the Posix TZ format.
#? 11
Please enter coordinates in ISO 6709 notation.
For example, +4042-07403 stands for
40 degrees 42 minutes north, 74 degrees 3 minutes west.
+5539+01221
Please select one of the following time zone regions,
listed roughly in increasing order of distance from +5539+01221.
1) Denmark			       6) Netherlands
2) Germany - most locations	       7) Czech Republic
3) Norway			       8) Aaland Islands
4) Russia - Moscow-01 - Kaliningrad    9) Poland
5) Sweden			      10) Latvia
#? 1

The following information has been given:

	coord +5539+01221
	Denmark

Therefore TZ='Europe/Copenhagen' will be used.
Local time is now:	Sun Aug  9 17:35:07 CEST 2015.
Universal Time is now:	Sun Aug  9 15:35:07 UTC 2015.
Is the above information OK?
1) Yes
2) No
#? 1

You can make this change permanent for yourself by appending the line
	TZ='Europe/Copenhagen'; export TZ
to the file '.profile' in your home directory; then log out and log in again.

Here is that TZ value again, this time on standard output so that you
can use the /usr/bin/tzselect command in shell scripts:
Europe/Copenhagen