| Abbreviation | Full Name | Difference to GMT (UT) | some Countries/States | Valid which time of the year? |
| HST | Hawaiian Standard Time | -10 | ||
| PST | Pacific Standard Time | -8 | last Sun Oct - 1st Sun Apr | |
| PDT | Pacific Daylight Time | -7 | 1st Sun Apr - last Sun Oct | |
| MST | Mountain Standard Time | -7 | last Sun Oct - 1st Sun Apr | |
| MDT | Mountain Daylight Time | -6 | 1st Sun Apr - last Sun Oct | |
| CST | Central Standard Time | -6 | last Sun Oct - 1st Sun Apr | |
| CDT | Central Daylight Time | -5 | 1st Sun Apr - last Sun Oct | |
| EST | Eastern Standard Time | -5 | last Sun Oct - 1st Sun Apr | |
| EDT | Eastern Daylight Time | -4 | 1st Sun Apr - last Sun Oct | |
| AST | Atlantic Standard Time | -4 | ||
| NST | Newfoundland STandard Time | -3.5 | ||
| ADT | Atlantic Daylight Time | -3 | ||
| NDT | Newfoundland Daylight Time | -2.5 | ||
| UT | Universal Time | 0 | ||
| WET | Western European Time | 0 | Portugal | |
| GMT | Greenwich Mean Time | 0 | England, Ireland | |
| GCT | Greenwich Civil Time | |||
| BST | British Summer Time | +1 | England, Ireland | |
| MET | Mid European Time | +1 | Germany, France, Sweden | |
| MEST | Mid European Summer Time | +2 | Germany, France, Sweden | |
| CET | Central European Time | |||
| CEST | Central European Summer Time | |||
| AWST | Australian Western STandard Time | +8 | ||
| JST | Japan Standard Time | +9 | ||
| ACST | Australian Central Standard Time | +9.5 | ||
| AEST | Australian Eastern Standard Time | +10 | ||
| NZT | New Zealand Time | +12 | New Zealand | March to October |
| NZDT | New Zealand Daylight Time | +13 | New Zealand | October to March |
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