Well, you can select another time zone if you need it, for example if you are doing remote observations, by setting the variable TZ to the appropriate name.
Unfortunately, names aren't completely standardized, but here are a few you can use:
MET Middle European Time : our time zone (CET also works) WET Western European Time, e.g. UK (also known as GMT, maybe even UT) EET Eastern European Time US/Eastern (EST5EDT) The various USA time zones US/Central (CST6CDT) US/Mountain (MST7MDT) US/Pacific (PST8PDT) US/Alaska US/Hawaii (HST) Chile/Continental ChileIf you can't find a proper name, you can always use
GMT+4
for the zone that is 4 hours ahead of GMT.
setenv TZ HST
  (setenv TZ HST;date)
  .xsession : start a clock for another time zone: