PHP Time locale for winter/summer time

If I am armed with the UTC and the JavaScript offset time offset, is there a PHP lib that will calculate local time, taking into account all the vagaries of winter and summer time?
metalaureateAsked:
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jet-blackCommented:
or you can use putenv() like:

<?php
  putenv ('TZ=Europe/Amsterdam');
  mktime(0,0,0,1,1,1970)
  echo date("H:i:s");
 ?>
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jet-blackCommented:
here is the list of supported timezones:
http://www.php.net/manual/en/timezones.php
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