Timezone abbreviations are, in general1, not standardized.
Furthermore, they can be ambiguous:
For example, there are five different interpretations of CST:
- Central Standard Time (North America)
- Central Standard Time (Australia)
- Central Summer Time (Australia)
- China Standard Time
- Cuba Standard Time
For these reasons, it's advised that timezone abbreviations should not be parsed.
In general, if an abbreviation is used, it should be for display purposes.
However, the use of timezone abbreviations in everyday conversations is undeniable. We decided to support a subset of the timezone abbreviations listed in wikipedia, duly documented in the table below for disambiguation. More may be supported in the future.
If a user sends a message with a reference to a timezone abbreviation that we don't support / doesn't exist, the bot notifies them of this.
| Abbreviation | Name | UTC offset |
|---|---|---|
| UTC | UTC | UTC+00:00 |
| GMT | GMT | UTC+00:00 |
| HST | Hawaii-Aleutian Standard Time | UTC-10:00 |
| HDT | Hawaii-Aleutian Daylight Time | UTC-09:00 |
| PST | Pacific Standard Time (North America) | UTC-08:00 |
| PDT | Pacific Daylight Time (North America) | UTC-07:00 |
| MST | Mountain Standard Time (North America) | UTC-07:00 |
| MDT | Mountain Daylight Time (North America) | UTC-06:00 |
| CST | Central Standard Time (North America) | UTC-06:00 |
| CDT | Central Daylight Time (North America) | UTC-05:00 |
| EST | Eastern Standard Time (North America) | UTC-05:00 |
| EDT | Eastern Daylight Time (North America) | UTC-04:00 |
| AST | Atlantic Standard Time | UTC-04:00 |
| ADT | Atlantic Daylight Time | UTC-03:00 |
| AMT | Amazon Time | UTC-04:00 |
| AMST | Amazon Summer Time | UTC-03:00 |
| CLT | Chile Standard Time | UTC-04:00 |
| CLST | Chile Summer Time | UTC-03:00 |
| BRT | Brasília Time | UTC-03:00 |
| BRST | Brasília Summer Time | UTC-02:00 |
| WET | Western European Time | UTC+00:00 |
| WEST | Western European Summer Time | UTC+01:00 |
| BST | British Summer Time | UTC+01:00 |
| CET | Central European Time | UTC+01:00 |
| CEST | Central European Summer Time | UTC+02:00 |
| WAT | West Africa Time | UTC+01:00 |
| WAST | West Africa Summer Time | UTC+02:00 |
| CAT | Central Africa Time | UTC+02:00 |
| SAST | South African Standard Time | UTC+02:00 |
| EET | Eastern European Time | UTC+02:00 |
| EEST | Eastern European Summer Time | UTC+03:00 |
| MSK | Moscow Time | UTC+03:00 |
| TRT | Turkey Time | UTC+03:00 |
| GET | Georgia Standard Time | UTC+04:00 |
| IST | India Standard Time | UTC+05:30 |
| AWST | Australian Western Standard Time | UTC+08:00 |
| AWDT | Australian Western Daylight Time | UTC+09:00 |
| ACWST | Australian Central Western Standard Time | UTC+08:45 |
| JST | Japan Standard Time | UTC+09:00 |
| KST | Korea Standard Time | UTC+09:00 |
| ACST | Australian Central Standard Time | UTC+09:30 |
| ACDT | Australian Central Daylight Time | UTC+10:30 |
| AEST | Australian Eastern Standard Time | UTC+10:00 |
| AEDT | Australian Eastern Daylight Time | UTC+11:00 |
| NZST | New Zealand Standard Time | UTC+12:00 |
| NZDT | New Zealand Daylight Time | UTC+13:00 |
Footnotes
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The notable exception being the 11 timezone abbreviations listed in RFC 822, section 5.1. ↩