East Aimak, Mongolia
East Aimak, generally known as Dornod Province, follows Ulaanbaatar time at UTC+8. Choibalsan and the province’s other communities share one official clock, while sunrise varies across eastern Mongolia.
Choibalsan, Mongolia
Friday, 4 September 2026
UTC+8 · Asia/Ulaanbaatar
Time and sun data for Choibalsan — the largest city of East Aimak
The sun in Choibalsan
Sunrise 05:44 Solar noon 12:22 Sunset 19:01 Daylight 13 h 16 min Night 10 h 44 min Civil twilight 05:12 – 19:33
Mongolia · 117 cities
Largest cities
- Choibalsan 44 835
- Halhgol 3 203
- Ereencav 23
All cities
- Alata
- Ara Jirgalanta Hiid
- Ara Unarshi Dugang
- Badmashin
- Bayan
- Bayan Bulag
- Bayan Bulag
- Bayan Delgeruulegchi Sume
- Bayan Don
- Bayan Uul
- Bayan-Uul
- Bayandun
- Bayantuemen
- Bayantumen Sum
- Bulagan Suma
- Bulgan
- Buuriin Haan
- Choibalsan
- Choybalsan
- Choybalsan Sum
- Chuluunhoroot
- Dabasan Suma
- Damba Daraja Hiid
- Dashbalbar
- Dochgol
- Dornod Aymag
- Dzahachi Örtöö
- Dzakhachi Urto
- Dzalaa
- Dzuunbulag
- Enger-Shand
- Erdeni Guunii Hiid
- Ereencav
- Ereentsav
- Galuut
- Gegeen Hiid
- Gurbanii Örtöö
- Gurbaniy Urto
- Gurvan Bayan
- Gurvandzagal
- Gurvanzagal Sum
- Guunii Hiid
- Hahatay
- Halha Horoo
- Halhaiin Sume
- Halhgol
- Halhgol
- Halyuutayn Holboo Ortoo
- Han-Uul
- Hara Erginii Ortoo
- Herlen
- Herlenbayan
- Hoeloenbuyr
- Hogno
- Högnö
- Hogshin Hiid
- Hoho Usanay Bayshing
- Höshöö Süme
- Hoshuu Sume
- Hujirta
- Hujirtayn Dugang
- Hulstay
- Hunta Suma
- Hushuu Sume
- Jaraahayn Ortoo
- Javarthushuu
- Jirgalanta Horshoo
- Jirgalantayn Suma
- Kherlen
- Khoeloenbuir
- Khoshu-Sume
- Khugun-Somon
- Lamaiin Hiid
- Lunii Bayshing
- Matad
- Mongolryba
- Moroks Shoroo Ayl
- Naranbulag
- Naydanii Hural
- Nuogannuoer
- Öbör Urtaiin Örtöö
- Oendoerhoshuu
- Olon Bayshing
- Onon
- Ovor-Ereen
- Sabangiin Ortoo
- Sabha Horoo
- Sergelen
- Shaft (Wall) Genghis Khan , railway station
- Shara Oboonii Bayshing
- Subsal Burideiin Horshoo
- Sudzhiyn
- Sudzhiyn-Urto
- Sumber
- Sumiyn Bulag
- Süüjiin Örtöö
- Tamsagbulag
- Tamsagiin Hiid
- Teegiin Sume
- Teregen Bayan Sume
- Tsagaan Usanii Ortoo
- Tsagaan-Ovoo
- Tsagaan-Ovoo Sum
- Tsagaan-Owoo
- Tsagaanders
- Tsagaannuur
- Tugiin Sume
- Ubur Urtyyn Urto
- Ugtamiin Araiin Ortoo
- Ugtamiin Hiid
- Ulaan Dzuleg
- Ulaan Tolgoy
- Ulan-Tsereg
- Ulhanii Mayhan
- Under
- Yehe Burham Sum
- Yihe Ayl
Current time in East Aimak, Mongolia
The displayed local time applies to Choibalsan and all of Dornod Province. “East Aimak” is a descriptive English name, while “Dornod” is the name commonly used for the province in current geographic references.
The province observes Asia/Ulaanbaatar time, equivalent to UTC+8. It does not currently advance or reverse clocks for a seasonal summer-time system. Travelers arriving from Mongolia’s western UTC+7 provinces therefore need to move their clocks forward by one hour under present rules.
Choibalsan is the provincial capital and principal urban center. Bayantümen and Dashbalbar are other notable soum centers. Although they share a time zone, their solar times are not identical because they occupy different coordinates.
Eastern Mongolia meets the morning early, but the alarm clock still demands its formal invitation.
Local time for calls and travel
An international invitation should say “Choibalsan time” or “Asia/Ulaanbaatar,” not merely “East Asian time.” The latter has no single offset and can be interpreted in several ways. Confirm the event’s local date in East Aimak.
Treat the province as UTC+8 under current rules. Convert using the recipient’s named time zone. Check whether either location is on the previous or following day. Within the province, moving between Choibalsan and a soum does not require resetting the clock. However, long distances mean that a shared time zone should never be mistaken for a short journey.
Choibalsan, soum centers, and sunrise
Choibalsan provides the most useful default coordinates for a general provincial clock. Bayantümen lies near the capital area, while Dashbalbar represents another settled district. Exact claims about the next-largest places require consistent population boundaries, so administrative importance and population size should remain distinct concepts.
Sunrise changes throughout the year and across the province. Since Dornod lies in Mongolia’s east, its solar day can begin earlier by the clock than at many western locations sharing UTC+8. The precise comparison still depends on latitude, longitude, and date.
A sunrise value is astronomical rather than a promise of clear daylight. Cloud, haze, buildings, and the natural horizon influence visibility. Civil dawn begins before sunrise and is useful for planning early outdoor activity; a driver should additionally consider weather and road conditions.
Questions and answers
- Is East Aimak the same as Dornod Province?
- Yes. East Aimak is an English descriptive name for Dornod.
- What UTC offset does Choibalsan use?
- Choibalsan uses UTC+8.
- Is sunrise simultaneous throughout East Aimak?
- No. Different coordinates produce different astronomical sunrise times.