ULAST — Ulaanbaatar Summer Time
See what ULAST means, its UTC+9 offset, how it relates to daylight saving time, and compare it with other time zones.
How to Convert ULAST to Other Time Zones
Open the ULAST converter page: Go to https://www.xconvert.com/time-converter/ulast-time-zone to open the visual comparison tool with Ulaanbaatar Summer Time (ULAST, UTC+9) as the reference row. This is useful when you need to line up working hours for a call involving Mongolia-related operations, East Asia suppliers, or regional travel planning across UTC+9 markets such as Seoul, Tokyo, and Irkutsk.
Add comparison cities: Click “+ Add City” and search for cities you want to compare against ULAST, such as London, New York, and Tokyo for finance, client support, and Asia-Pacific coordination. For example, London is important for European business hours, New York helps remote teams working with US partners, and Tokyo is relevant because Japan also runs on UTC+9 year-round, making it a practical same-offset benchmark.
Select a time range on the grid: Click “Select” to enter selection mode, then drag across the ULAST row to highlight a meeting window, such as 9:00 AM to 11:00 AM ULAST. That selection shows immediately across the other rows, so you can verify that 9:00 AM ULAST is 1:00 AM UTC, 10:00 PM in New York the previous day during EDT, and 9:00 AM in Tokyo, which helps confirm whether an Ulaanbaatar morning works for both Asian and North American participants.
Export or share the result: After selecting the range, use the export options shown by the tool: ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is especially helpful if you are scheduling a supplier call, a cross-border logistics handoff, or a distributed engineering meeting and want every participant to receive the event in their own local time automatically.
About Ulaanbaatar Summer Time (ULAST)
ULAST stands for Ulaanbaatar Summer Time, the daylight saving time designation historically associated with Ulaanbaatar, Mongolia. Its exact offset is UTC+9:00, which means local clock time under ULAST is 9 hours ahead of Coordinated Universal Time; when it is 12:00 noon UTC, it is 9:00 PM ULAST.
ULAST is tied to Mongolia, specifically the capital Ulaanbaatar, the country’s political, financial, and transport center. Ulaanbaatar has a population of roughly 1.6 million people, and it sits in north-central Mongolia, where government administration, mining headquarters, banking activity, and most international business coordination are concentrated.
In practical terms, UTC+9 places ULAST in the same offset band as abbreviations such as JST (Japan Standard Time) and KST (Korea Standard Time), although those zones are not the same system and may differ in daylight saving rules. This matters for scheduling because if a business call is set for 3:00 PM ULAST, it is also 3:00 PM in Tokyo and Seoul when those cities are on their standard year-round UTC+9 clocks, but it will be 6:00 AM UTC and much earlier in Europe or North America.
ULAST is not a global civil time zone used across multiple countries in the way UTC itself is; it is a specific abbreviation connected to Mongolia’s summer clock setting. Users typically encounter it in historical records, software time zone labels, archived schedules, or systems that distinguish between Mongolia’s standard and summer offsets.
ULAST and Daylight Saving Time
ULAST is a daylight saving time designation, so it represents the summer clock rather than the standard clock. When daylight saving time is in effect, the clock is moved forward to UTC+9, and outside that period Mongolia historically used ULAT, Ulaanbaatar Time, UTC+8 as the standard counterpart.
For the current year, 2026, Mongolia does not currently observe daylight saving time, so there are no official 2026 switch dates for ULAST. In other words, there is no scheduled 2026 transition into ULAST and no scheduled 2026 transition back to ULAT, because the country discontinued seasonal clock changes after earlier periods of use.
Historically, when Mongolia did observe summer time, the shift was typically a one-hour advance from UTC+8 to UTC+9 in spring, followed by a return from UTC+9 to UTC+8 in autumn. If you are working with legacy timestamps, archived transport schedules, old calendar entries, or historical business records, it is important to confirm the exact year because a timestamp marked ULAST means the event occurred during a period when Mongolia’s summer time rules were active.
This distinction matters for international coordination. A meeting stored as 2:00 PM ULAST corresponds to 5:00 AM UTC, while 2:00 PM ULAT corresponds to 6:00 AM UTC, so confusing the two creates a one-hour scheduling error that can affect flights, remote team handoffs, and financial reporting cutoffs.
Frequently Asked Questions
What does ULAST stand for?
ULAST stands for Ulaanbaatar Summer Time. It is the daylight saving time label historically used for Ulaanbaatar, Mongolia, when the local clock was advanced to UTC+9:00 during the summer period.
Is ULAST the same as GMT?
No, ULAST is not the same as GMT. GMT is UTC+0, while ULAST is UTC+9, so ULAST is 9 hours ahead of GMT; for example, when it is 8:00 AM GMT, it is 5:00 PM ULAST.
Which cities use ULAST?
The principal city associated with ULAST is Ulaanbaatar, the capital of Mongolia. In practice, the abbreviation is mainly connected with Mongolia’s capital region and appears most often in historical or technical time zone references rather than in everyday consumer scheduling.
What is the UTC offset for ULAST?
The UTC offset for ULAST is +9:00. That means ULAST local time is always calculated as UTC plus 9 hours, so 6:30 PM ULAST equals 9:30 AM UTC on the same calendar day.
When does ULAST change?
For the current year, 2026, ULAST does not have active change dates, because Mongolia is not currently observing daylight saving time. Historically, ULAST changed when Mongolia moved clocks forward for summer and then back to ULAT (UTC+8) after the daylight saving period ended.
Is ULAST the same as UTC+9?
ULAST corresponds to UTC+9, but the abbreviation is more specific than the raw offset. Many places can share a UTC+9 offset at a given moment, including regions using JST or KST, yet those are separate time zone systems with different naming conventions and daylight saving histories.
Which countries use ULAST today?
There are no countries currently using ULAST as an active civil time standard in 2026. The abbreviation is mainly relevant for historical Mongolia timekeeping, archived schedules, and systems that preserve older daylight saving labels.
How far ahead is ULAST from UTC and New York?
ULAST is 9 hours ahead of UTC. Compared with New York, the difference depends on whether New York is on EST (UTC-5) or EDT (UTC-4); ULAST is 14 hours ahead of EST and 13 hours ahead of EDT, so 9:00 AM ULAST is 7:00 PM EDT on the previous day.