Time zone · Asia
HST
Hovd Standard Time
Hovd Standard Time (HST) is Mongolia's westernmost offset, keeping a steady UTC+07:00 all year—no daylight saving time in the western provinces of Bayan-Ölgii, Hovd and Uvs.
Thursday, October 15, 2026
Current offset
UTC+07:00
Standard · +07
Daylight saving
Not observed
Year-round standard time
IANA zones
1
None observe daylight saving
DST offset
—
No summer variant
About HST
A fixed, year-round offset.
Hovd Standard Time (HST) is Mongolia's westernmost offset, keeping a steady UTC+07:00 all year—no daylight saving time in the western provinces of Bayan-Ölgii, Hovd and Uvs.
IANA zones · the technical identifiers
The zone that resolve to HST.
For software, always store the IANA identifier — never the abbreviation alone. The database keeps these zones distinct because their rules can, and historically did, diverge.
Where HST is used
One country.
Same offset · UTC+07:00
Other zones at UTC+07:00 right now.
These named zones share HST's offset today. When daylight saving rules differ, they drift apart for part of the year.
Convert
HST to the world's clocks.
Frequently asked questions
Common questions about HST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- What is the only timezone code that uses UTC+07:00 in Mongolia?
- HST (Hovd Standard Time) is the sole timezone code in Mongolia that uses UTC+07:00, covering the western part of the country including the Hovd Province.
- Why does Mongolia have different UTC offsets?
- Mongolia spans a large east-to-west distance, so it uses two main timezone codes: Ulaanbaatar Time (UTC+08:00) for the east and central areas, and Hovd Time (UTC+07:00) for the western regions.
- Which countries share the UTC+07:00 offset?
- Besides western Mongolia (HST), the UTC+07:00 offset is also used by Thailand, Vietnam, Cambodia, Indonesia (Western Indonesia Time), and Russia’s Krasnoyarsk region.
- Does HST observe daylight saving time?
- No. HST remains on UTC+07:00 throughout the year; Mongolia stopped observing daylight saving in 2016, simplifying timekeeping in the region.
- Why does Mongolia use UTC+07:00 instead of UTC+08:00?
- Since Hovd is geographically located further west, using UTC+07:00 keeps solar noon closer to 12:00 pm, aligning daily life rhythms more naturally with sunrise and daylight.
- How does HST compare to neighboring time zones?
- HST is one hour behind Ulaanbaatar Standard Time (ULAT, UTC+08:00) in eastern Mongolia, and it matches Thailand’s ICT and parts of Russia’s Krasnoyarsk Time.
- Do flights to western Mongolia sometimes cross two time zones?
- No. A flight from Ulaanbaatar (UTC+08:00) to Hovd (UTC+07:00) crosses one time-zone boundary, so travelers set their clocks back one hour.
Source: IANA tzdb2026d · Reviewed
Free · Developer API
This time zone, as JSON.
Its defining offset, DST status and member counts, from one endpoint.
Also in the API: time zones by coordinates, conversions that flag daylight saving gaps, and abbreviations decoded.
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