OMSST — Omsk Summer Time
See what OMSST means, its UTC+7 offset, how it relates to daylight saving time, and compare it with other time zones.
How to Convert OMSST to Other Time Zones
Open the OMSST converter page: Go to https://www.xconvert.com/time-converter/omsst-time-zone to open the visual comparison grid with Omsk Summer Time (OMSST) already loaded. This page is useful when you need to line up working hours for a call involving western Siberia, such as coordinating with logistics, energy, or industrial teams operating around Omsk and nearby UTC+7 regions.
Add comparison cities: Click + Add City and search for cities such as Moscow, Dubai, and Bangkok to compare OMSST with major business hubs that often interact with UTC+7 markets through trade, aviation, and regional operations. For example, Moscow is important for Russia-wide scheduling, Dubai is commonly used for energy and freight coordination, and Bangkok is relevant because Indochina Time also runs at UTC+7 year-round.
Select a time range on the grid: Click Select if needed, then drag across the OMSST row to highlight a meeting window, such as 9:00 AM to 11:00 AM OMSST. That selection shows immediately how the same period maps elsewhere: 6:00 AM to 8:00 AM in Moscow (UTC+4 during Russian summer alignment examples do not apply today, but Moscow is permanently UTC+3 now, so this is 5:00 AM to 7:00 AM MSK), 6:00 AM to 8:00 AM in Dubai (UTC+4), and 9:00 AM to 11:00 AM in Bangkok (UTC+7), helping you see whether a Siberia morning overlaps with partner offices in Europe, the Gulf, or Southeast Asia.
Export and share the result: After selecting the range, use the export options shown on the page: ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is practical for sending a confirmed OMSST-based meeting slot to a distributed team so each recipient sees the event in local time automatically, whether they are booking a plant handoff, a client call, or a cross-border operations review.
About Omsk Summer Time (OMSST)
OMSST stands for Omsk Summer Time, a seasonal daylight saving time designation historically associated with the Omsk time zone in Russia. Its exact offset is UTC+7, which means local clock time in OMSST is 7 hours ahead of Coordinated Universal Time and 7 hours ahead of GMT in winter-only comparison terms, although GMT and UTC are not always used identically in technical systems.
Omsk Summer Time has been used in Russia, specifically in the Omsk region and related western Siberian areas when daylight saving rules were in effect. The principal reference city is Omsk, a major city in southwestern Siberia with a population of roughly 1.1 million, located near the Irtysh River and serving as an important rail, industrial, petrochemical, and logistics center between the Urals and deeper Siberia.
When OMSST is active at UTC+7, it is 1 hour ahead of Omsk Standard Time (OMST, UTC+6). In practical scheduling terms, when it is 9:00 AM OMSST, it is 2:00 AM UTC, 5:00 AM in Moscow (UTC+3), 6:00 AM in Dubai (UTC+4), and 9:00 AM in Bangkok or Jakarta during Western Indonesia Time zones that use UTC+7 equivalents such as WIB. This makes OMSST especially relevant for comparing western Siberia with Southeast Asia, Gulf trade routes, and central Russian headquarters.
Several other abbreviations share the same UTC+7 offset at least during some part of the year or in fixed-offset usage, including CXT, DAVT, G, HOVT, ICT, KRAT, NOVST, NOVT, and WIB. Even so, equal offset does not mean the zones are interchangeable, because each abbreviation can apply to different countries, legal rules, and daylight saving practices.
OMSST and Daylight Saving Time
OMSST is a daylight saving time label rather than a permanent year-round zone. It represents the summer clock setting of UTC+7, and its standard-time counterpart is Omsk Standard Time (OMST), UTC+6, meaning clocks move forward by 1 hour when switching from standard time to summer time and back by 1 hour when returning to standard time.
Historically, regions using Omsk time followed Russia’s older daylight saving schedule, typically switching to OMSST in spring and back to OMST in autumn. Under that system, clocks generally moved forward on the last Sunday in March and moved back on the last Sunday in October, usually at 2:00 AM local standard or daylight time depending on the transition rule in force.
For the current year, 2026, the exact calendar dates corresponding to that historical DST pattern would be:
- Start of OMSST: Sunday, 29 March 2026
- End of OMSST: Sunday, 25 October 2026
However, there is an important real-world caveat: Russia no longer observes daylight saving time nationwide under current law. That means OMSST is mainly encountered in historical data, legacy software, archived schedules, older aviation or IT records, and timezone databases that preserve former abbreviations for reference. If you are scheduling a current event in Omsk today, you should verify the modern legal local time used in Russia rather than assuming seasonal OMSST switching still applies.
Frequently Asked Questions
What does OMSST stand for?
OMSST stands for Omsk Summer Time. It is the daylight saving version of the Omsk time zone and corresponds to UTC+7, meaning the local time is seven hours ahead of UTC when this designation is in use.
Is OMSST the same as GMT?
No, OMSST is not the same as GMT. OMSST is UTC+7, so when it is 12:00 noon GMT, it is 7:00 PM OMSST; the two are separated by a full seven hours.
Which cities use OMSST?
The main city associated with OMSST is Omsk, the administrative center of Omsk Oblast in Russia. Historically, this abbreviation applied to the local summer time used in that region, but because Russia no longer uses daylight saving time, OMSST is now mostly seen in historical references rather than in current everyday scheduling.
What is the UTC offset for OMSST?
The UTC offset for OMSST is +7 hours, written as UTC+7 or UTC+07:00. This means you add seven hours to UTC to get OMSST, so 3:00 PM UTC becomes 10:00 PM OMSST.
When does OMSST change?
Under the historical daylight saving pattern, OMSST would begin on the last Sunday in March and end on the last Sunday in October. For 2026, those dates are 29 March 2026 and 25 October 2026, but in modern practice Russia does not currently switch to OMSST, so those dates are mainly relevant for legacy or archival timezone interpretation.
Is OMSST the same as ICT or WIB because they are all UTC+7?
Not exactly. ICT (Indochina Time) and WIB (Western Indonesia Time) also use UTC+7, so the clock reading can match OMSST, but they apply to different countries and legal time systems. For example, Bangkok and Jakarta’s WIB region can show the same hour as OMSST while still being distinct timezone identifiers for software, travel itineraries, and compliance records.
How far ahead is OMSST from UTC and Moscow?
OMSST is 7 hours ahead of UTC and 4 hours ahead of modern Moscow Time (MSK, UTC+3). So if it is 9:00 AM in Moscow, it would be 1:00 PM OMSST, which is a useful comparison for companies coordinating between central Russia headquarters and western Siberian operations.
Does OMSST still matter if Russia no longer uses daylight saving time?
Yes, it still matters in historical timestamps, old calendar entries, legacy enterprise systems, and timezone database lookups. If you work with archived transport records, older financial logs, or software that stores past timezone abbreviations, understanding that OMSST meant UTC+7 summer time for Omsk helps prevent one-hour conversion errors.