Asia/Srednekolymsk

Time zone identifier: Asia/Srednekolymsk

Current civil offset: +11:00 (+11)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1924-05-01

Local Mean Time (LMT): +10:14:52 based on geographic meridian

Total recorded transitions: 65 transitions across 4 distinct offsets

Associated countries: RU

Historical Offset Step Chart (1880 to Present)

Text summary: Asia/Srednekolymsk shifted between 4 distinct offsets from 1924-05-01 through the modern era.

Complete Transition History (65 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1924-05-01T13:45:08Z`	`1924-05-01 23:45:08`	+10:14:52 → +10:00	`+10`	No	overlap
`1930-06-20T14:00:00Z`	`1930-06-21 01:00:00`	+10:00 → +11:00	`+11`	No	gap
`1981-03-31T13:00:00Z`	`1981-04-01 01:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1981-09-30T12:00:00Z`	`1981-09-30 23:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1982-03-31T13:00:00Z`	`1982-04-01 01:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1982-09-30T12:00:00Z`	`1982-09-30 23:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1983-03-31T13:00:00Z`	`1983-04-01 01:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1983-09-30T12:00:00Z`	`1983-09-30 23:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1984-03-31T13:00:00Z`	`1984-04-01 01:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1984-09-29T15:00:00Z`	`1984-09-30 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1985-03-30T15:00:00Z`	`1985-03-31 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1985-09-28T15:00:00Z`	`1985-09-29 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1986-03-29T15:00:00Z`	`1986-03-30 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1986-09-27T15:00:00Z`	`1986-09-28 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1987-03-28T15:00:00Z`	`1987-03-29 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1987-09-26T15:00:00Z`	`1987-09-27 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1988-03-26T15:00:00Z`	`1988-03-27 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1988-09-24T15:00:00Z`	`1988-09-25 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1989-03-25T15:00:00Z`	`1989-03-26 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1989-09-23T15:00:00Z`	`1989-09-24 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1990-03-24T15:00:00Z`	`1990-03-25 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1990-09-29T15:00:00Z`	`1990-09-30 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1991-03-30T15:00:00Z`	`1991-03-31 02:00:00`	+11:00 → +11:00	`+11`	Yes	offset-only
`1991-09-28T16:00:00Z`	`1991-09-29 02:00:00`	+11:00 → +10:00	`+10`	No	overlap
`1992-01-18T16:00:00Z`	`1992-01-19 03:00:00`	+10:00 → +11:00	`+11`	No	gap
`1992-03-28T15:00:00Z`	`1992-03-29 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1992-09-26T15:00:00Z`	`1992-09-27 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1993-03-27T15:00:00Z`	`1993-03-28 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1993-09-25T15:00:00Z`	`1993-09-26 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1994-03-26T15:00:00Z`	`1994-03-27 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1994-09-24T15:00:00Z`	`1994-09-25 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1995-03-25T15:00:00Z`	`1995-03-26 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1995-09-23T15:00:00Z`	`1995-09-24 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1996-03-30T15:00:00Z`	`1996-03-31 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1996-10-26T15:00:00Z`	`1996-10-27 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1997-03-29T15:00:00Z`	`1997-03-30 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1997-10-25T15:00:00Z`	`1997-10-26 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1998-03-28T15:00:00Z`	`1998-03-29 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1998-10-24T15:00:00Z`	`1998-10-25 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`1999-03-27T15:00:00Z`	`1999-03-28 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`1999-10-30T15:00:00Z`	`1999-10-31 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`2000-03-25T15:00:00Z`	`2000-03-26 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`2000-10-28T15:00:00Z`	`2000-10-29 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`2001-03-24T15:00:00Z`	`2001-03-25 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`2001-10-27T15:00:00Z`	`2001-10-28 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`2002-03-30T15:00:00Z`	`2002-03-31 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`2002-10-26T15:00:00Z`	`2002-10-27 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`2003-03-29T15:00:00Z`	`2003-03-30 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`2003-10-25T15:00:00Z`	`2003-10-26 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`2004-03-27T15:00:00Z`	`2004-03-28 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`2004-10-30T15:00:00Z`	`2004-10-31 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`2005-03-26T15:00:00Z`	`2005-03-27 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`2005-10-29T15:00:00Z`	`2005-10-30 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`2006-03-25T15:00:00Z`	`2006-03-26 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`2006-10-28T15:00:00Z`	`2006-10-29 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`2007-03-24T15:00:00Z`	`2007-03-25 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`2007-10-27T15:00:00Z`	`2007-10-28 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`2008-03-29T15:00:00Z`	`2008-03-30 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`2008-10-25T15:00:00Z`	`2008-10-26 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`2009-03-28T15:00:00Z`	`2009-03-29 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`2009-10-24T15:00:00Z`	`2009-10-25 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`2010-03-27T15:00:00Z`	`2010-03-28 03:00:00`	+11:00 → +12:00	`+12`	Yes	gap
`2010-10-30T15:00:00Z`	`2010-10-31 02:00:00`	+12:00 → +11:00	`+11`	No	overlap
`2011-03-26T15:00:00Z`	`2011-03-27 03:00:00`	+11:00 → +12:00	`+12`	No	gap
`2014-10-25T14:00:00Z`	`2014-10-26 01:00:00`	+12:00 → +11:00	`+11`	No	overlap

Notes from the Maintainers

Source: europe (Lines 3466 to 3508)

From Tim Parenti (2014-07-06):
Asia/Srednekolymsk covers parts of (14, RU-SA) Sakha (Yakutia) Republic:
14-01	****	Abyysky District
14-03	****	Allaikhovsky District
14-08	****	Verkhnekolymsky District
14-17	****	Momsky District
14-20	****	Nizhnekolymsky District
14-25	****	Srednekolymsky District

...and parts of (65, RU-SAK) Sakhalin Oblast:
65-11	****	Severo-Kurilsky District (North Kuril Islands)

From Tim Parenti (2014-07-02):
Oymyakonsky District of Sakha Republic (represented by Ust-Nera), along with
most of Sakhalin Oblast (represented by Sakhalin) will be moving to UTC+10 on
2014-10-26 to stay aligned with VLAT/SAKT; however, Severo-Kurilsky District
of the Sakhalin Oblast (also known as the North Kuril Islands, represented by
Severo-Kurilsk) will remain on UTC+11.

From Tim Parenti (2014-07-06):
Assume North Kuril Islands have history like Magadan before 2011-03-27.
There is a decent chance this is wrong, in which case a new zone
Asia/Severo-Kurilsk would become necessary.

Srednekolymsk and Zyryanka are the most populous places amongst these
districts, but have very similar populations.  In fact, Wikipedia currently
lists them both as having 3528 people, exactly 1668 males and 1860 females
each!  (Yikes!)
https://en.wikipedia.org/w/?title=Srednekolymsky_District&oldid=603435276
https://en.wikipedia.org/w/?title=Verkhnekolymsky_District&oldid=594378493
Assume this is a mistake, albeit an amusing one.

Looking at censuses, the populations of the two municipalities seem to have
fluctuated recently.  Zyryanka was more populous than Srednekolymsk in the
1989 and 2002 censuses, but Srednekolymsk was more populous in the most
recent (2010) census, 3525 to 3170.  (See pages 195 and 197 of
http://www.gks.ru/free_doc/new_site/perepis2010/croc/Documents/Vol1/pub-01-05.pdf
in Russian.)  In addition, Srednekolymsk appears to be a much older
settlement and the population of Zyryanka seems to be declining.
Go with Srednekolymsk.

Attributed Statements:

Tim Parenti (2014-07-06):

Asia/Srednekolymsk covers parts of (14, RU-SA) Sakha (Yakutia) Republic: 14-01 **** Abyysky District 14-03 **** Allaikhovsky District 14-08 **** Verkhnekolymsky District 14-17 **** Momsky District 14-20 **** Nizhnekolymsky District 14-25 **** Srednekolymsky District ...and parts of (65, RU-SAK) Sakhalin Oblast: 65-11 **** Severo-Kurilsky District (North Kuril Islands)

Tim Parenti (2014-07-02):

Oymyakonsky District of Sakha Republic (represented by Ust-Nera), along with most of Sakhalin Oblast (represented by Sakhalin) will be moving to UTC+10 on 2014-10-26 to stay aligned with VLAT/SAKT; however, Severo-Kurilsky District of the Sakhalin Oblast (also known as the North Kuril Islands, represented by Severo-Kurilsk) will remain on UTC+11.

Tim Parenti (2014-07-06):

Assume North Kuril Islands have history like Magadan before 2011-03-27. There is a decent chance this is wrong, in which case a new zone Asia/Severo-Kurilsk would become necessary. Srednekolymsk and Zyryanka are the most populous places amongst these districts, but have very similar populations. In fact, Wikipedia currently lists them both as having 3528 people, exactly 1668 males and 1860 females each! (Yikes!) https://en.wikipedia.org/w/?title=Srednekolymsky_District&oldid=603435276 https://en.wikipedia.org/w/?title=Verkhnekolymsky_District&oldid=594378493 Assume this is a mistake, albeit an amusing one. Looking at censuses, the populations of the two municipalities seem to have fluctuated recently. Zyryanka was more populous than Srednekolymsk in the 1989 and 2002 censuses, but Srednekolymsk was more populous in the most recent (2010) census, 3525 to 3170. (See pages 195 and 197 of http://www.gks.ru/free_doc/new_site/perepis2010/croc/Documents/Vol1/pub-01-05.pdf in Russian.) In addition, Srednekolymsk appears to be a much older settlement and the population of Zyryanka seems to be declining. Go with Srednekolymsk.

Years on Record

Methodology Note: The 1970 Rule

tzdb guarantees accuracy for timestamps from 1970 onwards. Transitions prior to 1970 represent best-effort historical reconstructions.