The Republic of Sakha is the only federal subject of Russia which uses more than one time zone. Sakha spans three time zones.[1]

Time zones in Sakha from 26 October 2014.
UTC+09:00 (MSK+6)
UTC+10:00 (MSK+7)
UTC+11:00 (MSK+8)
Map Time zone Abbr. UTC offset Areas
Yakutsk Time YAKT UTC+09:00 Most of the republic's territory.
Vladivostok Time VLAT UTC+10:00 Districts of Oymyakonsky, Ust-Yansky and Verkhoyansky.
Magadan Time MAGT UTC+11:00 Districts of Abyysky, Allaikhovsky, Momsky, Nizhnekolymsky, Srednekolymsky and Verkhnekolymsky.

History

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Time zones in Sakha before September 2011.
standard DST
UTC+09:00 UTC+10:00 (MSK+6)
UTC+10:00 UTC+11:00 (MSK+7)
UTC+11:00 UTC+12:00 (MSK+8)

Decree No. 725 of 31 August 2011 changed Moscow Time (MSK) from UTC+03:00, or UTC+04:00 during with seasonal daylight saving time (DST), to UTC+04:00 all year. Therefore, the time zones of Sakha, which were MSK+6, MSK+7 and MSK+8, changed from UTC+09:00, UTC+10:00 and UTC+11:00 (or UTC+10:00, UTC+11:00 and UTC+12:00 during DST) to UTC+10:00, UTC+11:00 and UTC+12:00 all year. As the decree took effect when DST was already observed, there was no change in local time in most of Sakha. However, the decree also changed the offset of some parts of Sakha with respect to Moscow Time (MSK), and thus to UTC.[2]

Time zone changes in Sakha in September 2011
Areas Before After
MSK offset UTC offset MSK offset UTC offset
all year standard DST all year
Oymyakonsky District MSK+8 UTC+11:00 UTC+12:00 MSK+7 UTC+11:00
New Siberian Islands
Tomponsky District
Ust-Maysky District
MSK+7 UTC+10:00 UTC+11:00 MSK+6 UTC+10:00

On 26 October 2014, Moscow Time reverted to UTC+03:00, also without seasonal changes. The time offset in all parts of Sakha with respect to Moscow Time remained the same (MSK+6, MSK+7, MSK+8), but changed with respect to UTC (becoming again UTC+09:00, UTC+10:00, UTC+11:00).[3]

IANA time zone database

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Country Coordinates Time zone name IANA description UTC offset Districts
RU +623923+1353314 Asia/Khandyga MSK+06 - Tomponsky, Ust-Maysky UTC+09:00 Tomponsky, Ust-Maysky
RU +6728+15343 Asia/Srednekolymsk MSK+08 - Sakha (E); North Kuril Is UTC+11:00
RU +643337+1431336 Asia/Ust-Nera MSK+07 - Oymyakonsky UTC+10:00 Oymyakonsky
RU +6200+12940 Asia/Yakutsk MSK+06 - Lena River UTC+09:00
RU Asia/Vladivostok MSK+07 - ... UTC+10:00 Ust-Yansky, Verkhoyansky
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References

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