Timezone Reference
Overview
This article compares timezone identifiers used by AhsayOBS, Olson timezone identifiers used by MyClient, and Windows timezone specifiers (excluding specific territory values). This reference file is intended to aid in troubleshooting timezone differences between clients, servers, and MyClient.
There is no 1:1 bijection between Ahsay timezones and Olson timezones, or between Olson timezones and Windows timezones. This may cause issues around edge cases such as Daylight Savings time. The AhsayOBM / AhsayACB client use the local Windows time to determine the JRE's timezone in Olson format, and schedule backups using this local time. AhsayOBS calculates expected schedule times and missed-backup notifications by converting the configured Ahsay timezone into Olson format.
Reference table
| Ahsay | Olson (MyClient, Java JRE) | Windows |
|---|---|---|
| GMT-11:00 (GMT-11:00) | Etc/GMT+11 | UTC-11 |
| GMT-11:00 (WST) | Pacific/Apia | Samoa Standard Time |
| GMT-11:00 (SST) | Pacific/Pago_Pago | UTC-11 |
| GMT-11:00 (NUT) | Pacific/Niue | UTC-11 |
| GMT-10:00 (GMT-10:00) | Etc/GMT+10 | Hawaiian Standard Time |
| GMT-10:00 (TKT) | Pacific/Fakaofo | Tonga Standard Time |
| GMT-10:00 (CKT) | Pacific/Rarotonga | Hawaiian Standard Time |
| GMT-10:00 (TAHT) | Pacific/Tahiti | Hawaiian Standard Time |
| GMT-07:00 (GMT-07:00) | Etc/GMT+7 | US Mountain Standard Time |
| GMT-06:00 (EDT) | America/Rankin_Inlet | Central Standard Time |
| GMT-06:00 (GMT-06:00) | Etc/GMT+6 | Central America Standard Time |
| GMT-06:00 (GALT) | Pacific/Galapagos | Central America Standard Time |
| GMT-05:00 (COT) | America/Bogota | SA Pacific Standard Time |
| GMT-05:00 (ECT) | America/Guayaquil | SA Pacific Standard Time |
| GMT-05:00 (PET) | America/Lima | SA Pacific Standard Time |
| GMT-05:00 (GMT-05:00) | Etc/GMT+5 | SA Pacific Standard Time |
| GMT-04:00 (PYT) | America/Asuncion | Paraguay Standard Time |
| GMT-04:00 (VET) | America/Caracas | Venezuela Standard Time |
| GMT-04:00 (GYT) | America/Guyana | SA Western Standard Time |
| GMT-04:00 (BOT) | America/La_Paz | SA Western Standard Time |
| GMT-04:00 () | Atlantic/Stanley | SA Eastern Standard Time |
| GMT-04:00 (GMT-04:00) | Etc/GMT+4 | SA Western Standard Time |
| GMT-03:00 (GFT) | America/Cayenne | SA Eastern Standard Time |
| GMT-03:00 (WGST) | America/Godthab | Greenland Standard Time |
| GMT-03:00 (UYT) | America/Montevideo | Montevideo Standard Time |
| GMT-03:00 (SRT) | America/Paramaribo | SA Eastern Standard Time |
| GMT-03:00 (ROTT) | Antarctica/Rothera | SA Eastern Standard Time |
| GMT-03:00 (GMT-03:00) | Etc/GMT+3 | SA Eastern Standard Time |
| GMT-02:00 (GST) | Atlantic/South_Georgia | UTC-02 |
| GMT-02:00 (GMT-02:00) | Etc/GMT+2 | UTC-02 |
| GMT-01:00 (EGST) | America/Scoresbysund | Azores Standard Time |
| GMT-01:00 (AZOST) | Atlantic/Azores | Azores Standard Time |
| GMT-01:00 (CVT) | Atlantic/Cape_Verde | Cape Verde Standard Time |
| GMT-01:00 (GMT-01:00) | Etc/GMT+1 | Cape Verde Standard Time |
| GMT+00:00 (WET) | Africa/El_Aaiun | Morocco Standard Time |
| GMT+00:00 (IST) | Europe/Dublin | GMT Standard Time |
| GMT+00:00 (BST) | Europe/London | GMT Standard Time |
| GMT+01:00 (CET) | Africa/Tunis | W. Central Africa Standard Time |
| GMT+01:00 (WAT) | Africa/Windhoek | Namibia Standard Time |
| GMT+01:00 (GMT+01:00) | Etc/GMT-1 | W. Central Africa Standard Time |
| GMT+02:00 (SAST) | Africa/Maseru | South Africa Standard Time |
| GMT+02:00 (SAST) | Africa/Mbabane | South Africa Standard Time |
| GMT+02:00 (GMT+02:00) | Etc/GMT-2 | South Africa Standard Time |
| GMT+03:00 (EAT) | Indian/Antananarivo | E. Africa Standard Time |
| GMT+03:00 (EAT) | Indian/Comoro | E. Africa Standard Time |
| GMT+03:00 (EAT) | Indian/Mayotte | E. Africa Standard Time |
| GMT+03:00 (SYOT) | Antarctica/Syowa | E. Africa Standard Time |
| GMT+03:00 (AST) | Asia/Bahrain | Arab Standard Time |
| GMT+03:00 (AST) | Asia/Kuwait | Arab Standard Time |
| GMT+03:00 (AST) | Asia/Qatar | Arab Standard Time |
| GMT+03:00 (AST) | Asia/Riyadh | Arab Standard Time |
| GMT+03:00 (ADT) | Asia/Baghdad | Arabic Standard Time |
| GMT+03:00 (GMT+03:00) | Etc/GMT-3 | E. Africa Standard Time |
| GMT+04:00 (AQTST) | Asia/Aqtau | West Asia Standard Time |
| GMT+04:00 (AZST) | Asia/Baku | Azerbaijan Standard Time |
| GMT+04:00 (GST) | Asia/Dubai | Arabian Standard Time |
| GMT+04:00 (GST) | Asia/Muscat | Arabian Standard Time |
| GMT+04:00 (ORAST) | Asia/Oral | West Asia Standard Time |
| GMT+04:00 (GEST) | Asia/Tbilisi | Georgian Standard Time |
| GMT+04:00 (GMT+04:00) | Etc/GMT-4 | Arabian Standard Time |
| GMT+04:00 (SAMST) | Europe/Samara | Russia Time Zone 3 |
| GMT+04:00 (SCT) | Indian/Mahe | Mauritius Standard Time |
| GMT+04:00 (MUT) | Indian/Mauritius | Mauritius Standard Time |
| GMT+04:00 (RET) | Indian/Reunion | Mauritius Standard Time |
| GMT+05:00 (AQTST) | Asia/Aqtobe | West Asia Standard Time |
| GMT+05:00 (TMT) | Asia/Samarkand | West Asia Standard Time |
| GMT+05:00 (KGST) | Asia/Bishkek | Central Asia Standard Time |
| GMT+05:00 (TJT) | Asia/Dushanbe | West Asia Standard Time |
| GMT+05:00 (UZT) | Asia/Tashkent | West Asia Standard Time |
| GMT+05:00 (YEKST) | Asia/Yekaterinburg | Ekaterinburg Standard Time |
| GMT+05:00 (GMT+05:00) | Etc/GMT-5 | West Asia Standard Time |
| GMT+05:00 (TFT) | Indian/Kerguelen | West Asia Standard Time |
| GMT+05:00 (MVT) | Indian/Maldives | West Asia Standard Time |
| GMT+06:00 (MAWT) | Antarctica/Mawson | West Asia Standard Time |
| GMT+06:00 (VOST) | Antarctica/Vostok | Central Asia Standard Time |
| GMT+06:00 (ALMST) | Asia/Almaty | Central Asia Standard Time |
| GMT+06:00 (LKT) | Asia/Colombo | Sri Lanka Standard Time |
| GMT+06:00 (NOVST) | Asia/Novosibirsk | N. Central Asia Standard Time |
| GMT+06:00 (OMSST) | Asia/Omsk | N. Central Asia Standard Time |
| GMT+06:00 (QYZST) | Asia/Qyzylorda | Central Asia Standard Time |
| GMT+06:00 (BTT) | Asia/Thimphu | Bangladesh Standard Time |
| GMT+06:00 (GMT+06:00) | Etc/GMT-6 | Central Asia Standard Time |
| GMT+06:00 (IOT) | Indian/Chagos | Central Asia Standard Time |
| GMT+07:00 (DAVT) | Antarctica/Davis | SE Asia Standard Time |
| GMT+07:00 (HOVT) | Asia/Hovd | SE Asia Standard Time |
| GMT+07:00 (WIT) | Asia/Pontianak | SE Asia Standard Time |
| GMT+07:00 (KRAST) | Asia/Krasnoyarsk | North Asia Standard Time |
| GMT+07:00 (GMT+07:00) | Etc/GMT-7 | SE Asia Standard Time |
| GMT+07:00 (CXT) | Indian/Christmas | SE Asia Standard Time |
| GMT+08:00 (WST) | Australia/Perth | W. Australia Standard Time |
| GMT+08:00 (BNT) | Asia/Brunei | Singapore Standard Time |
| GMT+08:00 (IRKST) | Asia/Irkutsk | North Asia East Standard Time |
| GMT+08:00 (MYT) | Asia/Kuala_Lumpur | Singapore Standard Time |
| GMT+08:00 (MYT) | Asia/Kuching | Singapore Standard Time |
| GMT+08:00 (PHT) | Asia/Manila | Singapore Standard Time |
| GMT+08:00 (ULAT) | Asia/Ulaanbaatar | Ulaanbaatar Standard Time |
| GMT+08:00 (GMT+08:00) | Etc/GMT-8 | Singapore Standard Time |
| GMT+09:00 (CHOT) | Asia/Choibalsan | Ulaanbaatar Standard Time |
| GMT+09:00 (TPT) | Asia/Dili | Tokyo Standard Time |
| GMT+09:00 (EIT) | Asia/Jayapura | Tokyo Standard Time |
| GMT+09:00 (YAKST) | Asia/Yakutsk | Yakutsk Standard Time |
| GMT+09:00 (GMT+09:00) | Etc/GMT-9 | Tokyo Standard Time |
| GMT+09:00 (PWT) | Pacific/Palau | Tokyo Standard Time |
| GMT+10:00 (EST) | Australia/Brisbane | E. Australia Standard Time |
| GMT+10:00 (EST) | Australia/Hobart | Tasmania Standard Time |
| GMT+10:00 (EST) | Australia/Lindeman | E. Australia Standard Time |
| GMT+10:00 (EST) | Australia/Melbourne | AUS Eastern Standard Time |
| GMT+10:00 (EST) | Australia/Sydney | AUS Eastern Standard Time |
| GMT+10:00 (DDUT) | Antarctica/DumontDUrville | West Pacific Standard Time |
| GMT+10:00 (SAKST) | Asia/Sakhalin | Vladivostok Standard Time |
| GMT+10:00 (VLAST) | Asia/Vladivostok | Vladivostok Standard Time |
| GMT+10:00 (GMT+10:00) | Etc/GMT-10 | West Pacific Standard Time |
| GMT+10:00 (ChST) | Pacific/Saipan | West Pacific Standard Time |
| GMT+10:00 (PGT) | Pacific/Port_Moresby | West Pacific Standard Time |
| GMT+10:00 (TRUT) | Pacific/Truk | West Pacific Standard Time |
| GMT+11:00 (MAGST) | Asia/Magadan | Magadan Standard Time |
| GMT+11:00 (GMT+11:00) | Etc/GMT-11 | Central Pacific Standard Time |
| GMT+11:00 (VUT) | Pacific/Efate | Central Pacific Standard Time |
| GMT+11:00 (KOST) | Pacific/Kosrae | Central Pacific Standard Time |
| GMT+11:00 (NCT) | Pacific/Noumea | Central Pacific Standard Time |
| GMT+11:00 (PONT) | Pacific/Ponape | Central Pacific Standard Time |
| GMT+12:00 (NZST) | Pacific/Auckland | New Zealand Standard Time |
| GMT+12:00 (ANAST) | Asia/Anadyr | Russia Time Zone 11 |
| GMT+12:00 (PETST) | Asia/Kamchatka | Russia Time Zone 11 |
| GMT+12:00 (GMT+12:00) | Etc/GMT-12 | UTC+12 |
| GMT+12:00 (MHT) | Pacific/Kwajalein | UTC+12 |
| GMT+12:00 (MHT) | Pacific/Majuro | UTC+12 |
| GMT+12:00 (FJT) | Pacific/Fiji | Fiji Standard Time |
| GMT+12:00 (TVT) | Pacific/Funafuti | UTC+12 |
| GMT+12:00 (NRT) | Pacific/Nauru | UTC+12 |
| GMT+12:00 (GILT) | Pacific/Tarawa | UTC+12 |
| GMT+12:00 (WAKT) | Pacific/Wake | UTC+12 |