Time::Zone -- miscellaneous timezone manipulations routines
	use Time::Zone;
	print tz2zone();
	print tz2zone($ENV{'TZ'});
	print tz2zone($ENV{'TZ'}, time());
	print tz2zone($ENV{'TZ'}, undef, $isdst);
	$offset = tz_local_offset();
	$offset = tz_offset($TZ);
This is a collection of miscellaneous timezone manipulation routines.
tz2zone() parses the TZ environment variable and returns a timezone
string suitable for inclusion in date-like output.  It opionally takes
a timezone string, a time, and a is-dst flag.
tz_local_offset() determins the offset from GMT time in seconds.  It
only does the calculation once.
tz_offset() determines the offset from GMT in seconds of a specified
timezone.  
tz_name() determines the name of the timezone based on its offset
Graham Barr <gbarr@pobox.com> David Muir Sharnoff <muir@idiom.com> Paul Foley <paul@ascent.com>