
Time in Mongolia is officially represented by the Mongolian Standard Time (UTC+08:00). However, the far western provinces of Khovd, Uvs and Bayan-Ölgii use UTC+07:00.
Mongolia used daylight saving time in 1983–1998, 2001–2006 and 2015–2016. However, Mongolia observes time almost exactly an hour ahead of its geographical time zone, with its border between UTC+7 and UTC+8 being almost exactly the longitudinal line of 97.5° E (which is really the designated border for between UTC+7 and UTC+6), so all of Mongolia could be said to be on permanent daylight/summer time.
The IANA time zone database contains two zones for Mongolia in the file zone.tab.
| c.c. | coordinates | TZ | comments | Standard time | Summer time | Notes |
|---|---|---|---|---|---|---|
| MN | +4755 | Asia | most of Mongolia | +08:00 | +08:00 | Link from Asia/Choibalsan, Asia/Ulan_Bator |
| MN | +4801 | Asia | Bayan-Ölgii, Hovd, Uvs | +07:00 | +07:00 | Bayan-Ölgii, Hovd, Uvs |