YAKST — Yakutsk Summer Time
See what YAKST means, its UTC+10 offset, how it relates to daylight saving time, and convert it to other time zones.
How to Convert YAKST to Other Time Zones
Open the YAKST converter page: Go to https://www.xconvert.com/time-converter/yakst-time-zone to load the visual comparison grid with Yakutsk Summer Time (YAKST) as the reference row. This is useful when you are scheduling a call with teams in eastern Russia, checking handoff windows for logistics operations across Siberia, or comparing local working hours before booking travel or support coverage.
Add comparison cities with the “+ Add City” button: Click + Add City and search for places you actually work with, such as Moscow for federal administration and domestic business coordination, Tokyo for Asia-Pacific trade timing, or Sydney because AEST shares the same standard UTC+10 offset during part of the year. Adding multiple rows lets you see immediately whether a YAKST afternoon overlaps with finance, aviation, or engineering teams elsewhere.
Drag on the grid to select a meeting window: Use the Select button if needed, then drag across the colored hourly slots on the YAKST row to highlight a time range in purple; you can resize it with the left and right handles or move it by dragging the center. For example, if you drag 9:00 AM to 11:00 AM YAKST (UTC+10), that corresponds to 8:00 AM to 10:00 AM in Tokyo (JST, UTC+9) and 11:00 PM to 1:00 AM in London during GMT (UTC+0), which quickly shows that a morning slot in Yakutsk is practical for Japan but usually too late for Europe.
Export and share the selected time range: Once a range is selected, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is especially helpful when you need to send a confirmed cross-border meeting slot to remote staff, attach the time block to a calendar invite so each participant sees it in local time automatically, or share a link with an operations team coordinating across multiple UTC offsets.
About Yakutsk Summer Time (YAKST)
YAKST stands for Yakutsk Summer Time, the daylight saving version of the time used in the Yakutsk region of Russia. Its exact offset is UTC+10:00, which means local clocks in YAKST are 10 hours ahead of Coordinated Universal Time. If it is 12:00 noon UTC, it is 10:00 PM in YAKST.
Historically, YAKST referred to the summer clock used in parts of eastern Russia centered on Yakutsk, the capital of the Sakha Republic (Yakutia). Yakutsk itself is one of the world’s largest cities built on continuous permafrost and has a population of roughly 350,000+ people, making it the main urban reference point for this time designation. In practical use, this time zone mattered for regional administration, mining operations, river transport on the Lena basin, and flight scheduling across Siberia and the Russian Far East.
YAKST is a daylight saving time abbreviation, not a year-round standard time. The standard counterpart was YAKT, Yakutsk Time, at UTC+09:00, while YAKST advanced clocks by one hour to UTC+10:00 during the summer season. Because Russia changed its time policies several times in the 2010s and later reduced reliance on seasonal clock changes, YAKST is now mainly encountered in historical records, older scheduling systems, archived timetables, and legacy software rather than in everyday modern civil time use.
YAKST shares the same UTC+10 offset as several other abbreviations at certain times of year, including AEST, AET, CHUT, ChST, DDUT, K, PGT, VLAT, and YAPT. That does not mean they are interchangeable in all contexts, because the underlying region, daylight saving rules, and seasonal behavior can differ. For example, AEST is used in eastern Australia without implying Yakutsk regional rules, while ChST refers to Chamorro Standard Time in Guam and the Northern Mariana Islands.
YAKST and Daylight Saving Time
YAKST is itself the daylight saving time form of Yakutsk time, meaning it appears when clocks are moved forward from YAKT (UTC+09:00) to YAKST (UTC+10:00) for the summer period. Under the older Russian seasonal system, the spring transition typically moved clocks ahead by one hour, and the autumn transition returned them to standard time. In that framework, YAKST was 1 hour ahead of YAKT.
For the current year, 2026, there are no active daylight saving transition dates for YAKST in modern civil use, because Russia does not currently observe seasonal DST changes in the Yakutsk region. That means there is no official 2026 spring switch into YAKST and no autumn switch back from YAKST for current local timekeeping. If you see YAKST in software, databases, or historical references, it usually reflects a legacy or archival label rather than a live annual change that people in Yakutsk are observing today.
Historically, when Russia did observe daylight saving time, the switch generally occurred in late March for the move into summer time and late October for the return to standard time, aligning with the country’s then-current national DST rules. Those exact dates varied by year depending on the legal framework in force, which is why modern schedulers should rely on current IANA time zone data or a live converter instead of assuming YAKST still changes every year. This matters for aviation archives, historical market timestamps, and older calendar data where a one-hour difference can affect departure times, shift records, or contract deadlines.
A practical way to think about it is this: YAKST = UTC+10, while YAKT = UTC+9. So when it was 9:00 AM YAKST, it would have been 8:00 AM YAKT on the same date. That one-hour difference was important for regional transport, government office hours, and communication with Moscow, which is many time zones to the west.
Frequently Asked Questions
What does YAKST stand for?
YAKST stands for Yakutsk Summer Time. It is the daylight saving time designation historically associated with the Yakutsk region of Russia, where the summer offset was UTC+10:00 instead of the standard UTC+09:00.
Is YAKST the same as GMT?
No, YAKST is not the same as GMT. GMT is UTC+0, while YAKST is UTC+10, so YAKST is 10 hours ahead of GMT; for example, when it is 8:00 AM GMT, it is 6:00 PM YAKST.
Which cities use YAKST?
The principal city associated with YAKST is Yakutsk, the capital of the Sakha Republic (Yakutia) in Russia. In modern practice, the abbreviation is mostly historical, so you are more likely to encounter it in archived schedules, old operating systems, or legacy time zone references than in current day-to-day local usage.
What is the UTC offset for YAKST?
The exact UTC offset for YAKST is UTC+10:00. That means clocks in YAKST are ten hours ahead of Coordinated Universal Time, so 2:00 PM UTC becomes 12:00 AM the next day in YAKST.
When does YAKST change?
In historical use, YAKST changed when clocks moved forward from YAKT (UTC+09:00) into summer time and later moved back again in autumn. For the current year 2026, there is no active official DST switch for Yakutsk, because Russia no longer uses seasonal daylight saving time there, so YAKST does not have current live transition dates.
Is YAKST still used today?
YAKST is mostly a historical or legacy abbreviation today rather than a commonly used current civil time label. Modern Russian timekeeping in the Yakutsk area does not follow the old annual DST pattern, so if you see YAKST in a database or app, it often refers to past timestamps or outdated zone naming conventions.
Is YAKST the same as AEST or other UTC+10 abbreviations?
They can match in offset, but they are not the same time zone identity. AEST, CHUT, ChST, PGT, VLAT, and YAKST may all show UTC+10 at certain times, but they refer to different regions with different legal rules, and some observe seasonal changes while others do not.
How far ahead is YAKST from UTC?
YAKST is 10 hours ahead of UTC. A simple conversion example is that 9:00 AM UTC equals 7:00 PM YAKST, which is useful when coordinating with Europe-based teams, cloud server logs stored in UTC, or international flight and shipping schedules.