PST8PDT

Time zone identifier: PST8PDT

Current civil offset: -08:00 (PST)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1918-03-31

Total recorded transitions: 148 transitions across 2 distinct offsets

Historical Offset Step Chart (1880 to Present)

Text summary: PST8PDT shifted between 2 distinct offsets from 1918-03-31 through the modern era.

Complete Transition History (148 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1918-03-31T10:00:00Z`	`1918-03-31 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1918-10-27T09:00:00Z`	`1918-10-27 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1919-03-30T10:00:00Z`	`1919-03-30 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1919-10-26T09:00:00Z`	`1919-10-26 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1942-02-09T10:00:00Z`	`1942-02-09 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1945-09-30T09:00:00Z`	`1945-09-30 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1967-04-30T10:00:00Z`	`1967-04-30 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1967-10-29T09:00:00Z`	`1967-10-29 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1968-04-28T10:00:00Z`	`1968-04-28 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1968-10-27T09:00:00Z`	`1968-10-27 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1969-04-27T10:00:00Z`	`1969-04-27 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1969-10-26T09:00:00Z`	`1969-10-26 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1970-04-26T10:00:00Z`	`1970-04-26 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1970-10-25T09:00:00Z`	`1970-10-25 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1971-04-25T10:00:00Z`	`1971-04-25 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1971-10-31T09:00:00Z`	`1971-10-31 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1972-04-30T10:00:00Z`	`1972-04-30 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1972-10-29T09:00:00Z`	`1972-10-29 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1973-04-29T10:00:00Z`	`1973-04-29 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1973-10-28T09:00:00Z`	`1973-10-28 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1974-01-06T10:00:00Z`	`1974-01-06 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1974-10-27T09:00:00Z`	`1974-10-27 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1975-02-23T10:00:00Z`	`1975-02-23 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1975-10-26T09:00:00Z`	`1975-10-26 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1976-04-25T10:00:00Z`	`1976-04-25 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1976-10-31T09:00:00Z`	`1976-10-31 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1977-04-24T10:00:00Z`	`1977-04-24 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1977-10-30T09:00:00Z`	`1977-10-30 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1978-04-30T10:00:00Z`	`1978-04-30 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1978-10-29T09:00:00Z`	`1978-10-29 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1979-04-29T10:00:00Z`	`1979-04-29 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1979-10-28T09:00:00Z`	`1979-10-28 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1980-04-27T10:00:00Z`	`1980-04-27 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1980-10-26T09:00:00Z`	`1980-10-26 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1981-04-26T10:00:00Z`	`1981-04-26 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1981-10-25T09:00:00Z`	`1981-10-25 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1982-04-25T10:00:00Z`	`1982-04-25 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1982-10-31T09:00:00Z`	`1982-10-31 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1983-04-24T10:00:00Z`	`1983-04-24 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1983-10-30T09:00:00Z`	`1983-10-30 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1984-04-29T10:00:00Z`	`1984-04-29 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1984-10-28T09:00:00Z`	`1984-10-28 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1985-04-28T10:00:00Z`	`1985-04-28 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1985-10-27T09:00:00Z`	`1985-10-27 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1986-04-27T10:00:00Z`	`1986-04-27 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1986-10-26T09:00:00Z`	`1986-10-26 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1987-04-05T10:00:00Z`	`1987-04-05 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1987-10-25T09:00:00Z`	`1987-10-25 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1988-04-03T10:00:00Z`	`1988-04-03 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1988-10-30T09:00:00Z`	`1988-10-30 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1989-04-02T10:00:00Z`	`1989-04-02 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1989-10-29T09:00:00Z`	`1989-10-29 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1990-04-01T10:00:00Z`	`1990-04-01 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1990-10-28T09:00:00Z`	`1990-10-28 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1991-04-07T10:00:00Z`	`1991-04-07 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1991-10-27T09:00:00Z`	`1991-10-27 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1992-04-05T10:00:00Z`	`1992-04-05 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1992-10-25T09:00:00Z`	`1992-10-25 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1993-04-04T10:00:00Z`	`1993-04-04 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1993-10-31T09:00:00Z`	`1993-10-31 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1994-04-03T10:00:00Z`	`1994-04-03 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1994-10-30T09:00:00Z`	`1994-10-30 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1995-04-02T10:00:00Z`	`1995-04-02 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1995-10-29T09:00:00Z`	`1995-10-29 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1996-04-07T10:00:00Z`	`1996-04-07 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1996-10-27T09:00:00Z`	`1996-10-27 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1997-04-06T10:00:00Z`	`1997-04-06 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1997-10-26T09:00:00Z`	`1997-10-26 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1998-04-05T10:00:00Z`	`1998-04-05 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1998-10-25T09:00:00Z`	`1998-10-25 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`1999-04-04T10:00:00Z`	`1999-04-04 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`1999-10-31T09:00:00Z`	`1999-10-31 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2000-04-02T10:00:00Z`	`2000-04-02 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2000-10-29T09:00:00Z`	`2000-10-29 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2001-04-01T10:00:00Z`	`2001-04-01 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2001-10-28T09:00:00Z`	`2001-10-28 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2002-04-07T10:00:00Z`	`2002-04-07 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2002-10-27T09:00:00Z`	`2002-10-27 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2003-04-06T10:00:00Z`	`2003-04-06 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2003-10-26T09:00:00Z`	`2003-10-26 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2004-04-04T10:00:00Z`	`2004-04-04 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2004-10-31T09:00:00Z`	`2004-10-31 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2005-04-03T10:00:00Z`	`2005-04-03 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2005-10-30T09:00:00Z`	`2005-10-30 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2006-04-02T10:00:00Z`	`2006-04-02 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2006-10-29T09:00:00Z`	`2006-10-29 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2007-03-11T10:00:00Z`	`2007-03-11 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2007-11-04T09:00:00Z`	`2007-11-04 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2008-03-09T10:00:00Z`	`2008-03-09 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2008-11-02T09:00:00Z`	`2008-11-02 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2009-03-08T10:00:00Z`	`2009-03-08 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2009-11-01T09:00:00Z`	`2009-11-01 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2010-03-14T10:00:00Z`	`2010-03-14 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2010-11-07T09:00:00Z`	`2010-11-07 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2011-03-13T10:00:00Z`	`2011-03-13 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2011-11-06T09:00:00Z`	`2011-11-06 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2012-03-11T10:00:00Z`	`2012-03-11 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2012-11-04T09:00:00Z`	`2012-11-04 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2013-03-10T10:00:00Z`	`2013-03-10 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2013-11-03T09:00:00Z`	`2013-11-03 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2014-03-09T10:00:00Z`	`2014-03-09 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2014-11-02T09:00:00Z`	`2014-11-02 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2015-03-08T10:00:00Z`	`2015-03-08 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2015-11-01T09:00:00Z`	`2015-11-01 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2016-03-13T10:00:00Z`	`2016-03-13 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2016-11-06T09:00:00Z`	`2016-11-06 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2017-03-12T10:00:00Z`	`2017-03-12 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2017-11-05T09:00:00Z`	`2017-11-05 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2018-03-11T10:00:00Z`	`2018-03-11 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2018-11-04T09:00:00Z`	`2018-11-04 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2019-03-10T10:00:00Z`	`2019-03-10 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2019-11-03T09:00:00Z`	`2019-11-03 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2020-03-08T10:00:00Z`	`2020-03-08 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2020-11-01T09:00:00Z`	`2020-11-01 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2021-03-14T10:00:00Z`	`2021-03-14 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2021-11-07T09:00:00Z`	`2021-11-07 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2022-03-13T10:00:00Z`	`2022-03-13 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2022-11-06T09:00:00Z`	`2022-11-06 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2023-03-12T10:00:00Z`	`2023-03-12 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2023-11-05T09:00:00Z`	`2023-11-05 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2024-03-10T10:00:00Z`	`2024-03-10 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2024-11-03T09:00:00Z`	`2024-11-03 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2025-03-09T10:00:00Z`	`2025-03-09 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2025-11-02T09:00:00Z`	`2025-11-02 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2026-03-08T10:00:00Z`	`2026-03-08 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2026-11-01T09:00:00Z`	`2026-11-01 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2027-03-14T10:00:00Z`	`2027-03-14 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2027-11-07T09:00:00Z`	`2027-11-07 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2028-03-12T10:00:00Z`	`2028-03-12 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2028-11-05T09:00:00Z`	`2028-11-05 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2029-03-11T10:00:00Z`	`2029-03-11 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2029-11-04T09:00:00Z`	`2029-11-04 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2030-03-10T10:00:00Z`	`2030-03-10 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2030-11-03T09:00:00Z`	`2030-11-03 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2031-03-09T10:00:00Z`	`2031-03-09 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2031-11-02T09:00:00Z`	`2031-11-02 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2032-03-14T10:00:00Z`	`2032-03-14 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2032-11-07T09:00:00Z`	`2032-11-07 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2033-03-13T10:00:00Z`	`2033-03-13 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2033-11-06T09:00:00Z`	`2033-11-06 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2034-03-12T10:00:00Z`	`2034-03-12 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2034-11-05T09:00:00Z`	`2034-11-05 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2035-03-11T10:00:00Z`	`2035-03-11 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2035-11-04T09:00:00Z`	`2035-11-04 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2036-03-09T10:00:00Z`	`2036-03-09 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2036-11-02T09:00:00Z`	`2036-11-02 01:00:00`	-07:00 → -08:00	`PST`	No	overlap
`2037-03-08T10:00:00Z`	`2037-03-08 03:00:00`	-08:00 → -07:00	`PDT`	Yes	gap
`2037-11-01T09:00:00Z`	`2037-11-01 01:00:00`	-07:00 → -08:00	`PST`	No	overlap

Notes from the Maintainers

Source: backward (Lines 350 to 371)

From Arthur David Olson (2005-12-19):
We generate the files specified below to guard against old files with
obsolete information being left in the time zone binary directory.
We limit the list to names that have appeared in previous versions of
this time zone package.
We do these as separate Zones rather than as Links to avoid problems if
a particular place changes whether it observes DST.

From Paul Eggert (2026-07-24):
These zones are for backward compatibility with Unix System V (1983).
They are ahistorical, in that they pretend standard time extends
backward indefinitely into the past.
They use USback (not US) rules so that they conform to POSIX instead
of using abbreviations like EWT for Eastern War Time during World War II.
The zones are here, not in the northamerica file, to lessen
confusion downstream by making it clear that the zones are present
only for backward compatibility.
New software should use settings like TZ='America/New_York' instead
of these backwards-compatibility zones.

Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]

Attributed Statements:

Arthur David Olson (2005-12-19):

We generate the files specified below to guard against old files with obsolete information being left in the time zone binary directory. We limit the list to names that have appeared in previous versions of this time zone package. We do these as separate Zones rather than as Links to avoid problems if a particular place changes whether it observes DST.

Paul Eggert (2026-07-24):

These zones are for backward compatibility with Unix System V (1983). They are ahistorical, in that they pretend standard time extends backward indefinitely into the past. They use USback (not US) rules so that they conform to POSIX instead of using abbreviations like EWT for Eastern War Time during World War II. The zones are here, not in the northamerica file, to lessen confusion downstream by making it clear that the zones are present only for backward compatibility. New software should use settings like TZ='America/New_York' instead of these backwards-compatibility zones. Zone NAME STDOFF RULES FORMAT [UNTIL]

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.