Here is an explanation of the time zone abbreviations used internationally and locally:
GMT - Greenwich Mean Time UTC - Universal Coordinated Time (the same as GMT). The initials are in the "wrong" order because they stand for the French translation.
US and Canada - see map (73Kbs) AST Atlantic Standard Time (GMT -4 hours) ADT Atlantic Daylight Saving Time (GMT -3 hours) EST Eastern Standard Time (GMT -5 hours) EDT Eastern Daylight Saving Time (GMT -4 hours) CST Central Standard Time (GMT -6 hours) CDT Central Daylight Saving Time (GMT -5 hours) MST Mountain Standard Time (GMT -7 hours) MDT Mountain Daylight Saving Time (GMT -6 hours) PST Pacific Standard Time (GMT -8 hours) PDT Pacific Daylight Saving Time (GMT -7 hours) AKST Alaska Standard Time (GMT -9 hours) AKDT Alaska Daylight Saving Time (GMT -8 hours) HST Hawaiian Standard Time (GMT -10 hours)
(Hawaii doesn't adjust for Daylight Saving)
Europe - see map (59Kbs) BST British Summer Time (GMT +1 hour) IST Irish Summer Time (GMT +1 hour) CET Central Europe Time (GMT +1 hour) CEST Central Europe Summer Time (GMT +2 hours) EET Eastern Europe Time (GMT +2 hours) EEST Eastern Europe Summer Time (GMT +3 hours)
Australia - see map (28Kbs) AEST Australian Eastern Standard Time (GMT +10 hours)