Historically distinct IANA time zone
America/Tijuana
- Countries
- Mexico
- GPS reference
- 32.53° N, 117.02° W
- Data source
- IANA northamerica
MexicoBaja California
Geographic context
Where this clock belongs
The map marks the IANA reference location and associated country, not a time-zone boundary.
GPS reference: 32.53° N, 117.02° W. Associated countries: MX.
The Wikipedia link provides additional context; it is not evidence for a historical claim. Transition data comes from the IANA source file.
Notes from the time database
The story behind the clock
These source notes describe a period or rule. They do not, by themselves, establish a causal claim for a particular clock change.
War
War
Peace
In early February 1948, in response to California's electricity shortage, PG&E changed power frequency from 60 to 59.5 Hz during daylight hours, causing electric clocks to lose six minutes per day. (This did not change legal time, and is not part of the data here.) See: Ross SA. An energy crisis from the past: Northern California in 1948. Working Paper No. 8, Institute of Governmental Studies, UC Berkeley, 1973-11. In another measure to save electricity, DST was instituted from 1948-03-14 at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move the fallback transition earlier. See pages 3-4 of: In response: Governor Warren received a torrent of objecting mail, and it is not too much to speculate that the objections to Daylight Saving Time were one important factor in the defeat of the Dewey-Warren Presidential ticket in California. -- Ross, p 25 On December 8 the governor exercised the option, setting the date to January 1 (LA Times 1948-12-09). The transition time was 02:00 (LA Times 1949-01-01). Despite the controversy, in 1949 California voters approved Proposition 12, which established DST from April's last Sunday at 01:00 until September's last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed the fall-back date to October's last Sunday. See:
Original IANA source file: northamerica.
A shared present
Same clock today, different past
These nearby zones follow the same current annual pattern, yet retain their own historical record.
United States of America · 204 km from the reference location · Same annual clock since 2010Civil-time record
Recorded changes over time
From 1922 to 2027 · 167 recorded transitions
Recurring daylight-saving changes are grouped separately when JavaScript is available.
Notable changes
One-off changes and transitions outside the recurring seasonal rhythm.
- -07:00 · MSTStandard time applies
- -08:00 · PSTStandard time applies
- -07:00 · MSTStandard time applies
- -08:00 · PSTStandard time applies
- -07:00 · PDTDaylight saving time begins
- -08:00 · PSTStandard time applies
Browse every recorded transition
| Local time after transition | Offset after | Abbreviation | Rule |
|---|---|---|---|
| 1922-01-01 00:00 | -07:00 | MST | Standard time |
| 1923-12-31 23:00 | -08:00 | PST | Standard time |
| 1927-06-10 01:00 | -07:00 | MST | Standard time |
| 1930-11-14 23:00 | -08:00 | PST | Standard time |
| 1931-04-01 01:00 | -07:00 | PDT | Daylight saving time |
| 1931-09-29 23:00 | -08:00 | PST | Standard time |
| 1942-04-24 01:00 | -07:00 | PWT | Daylight saving time |
| 1945-08-14 16:00 | -07:00 | PPT | Daylight saving time |
| 1945-11-14 23:00 | -08:00 | PST | Standard time |
| 1948-04-05 01:00 | -07:00 | PDT | Daylight saving time |
| 1949-01-13 23:00 | -08:00 | PST | Standard time |
| 1950-05-01 01:00 | -07:00 | PDT | Daylight saving time |
| 1950-09-23 23:00 | -08:00 | PST | Standard time |
| 1951-04-29 03:00 | -07:00 | PDT | Daylight saving time |
| 1951-09-30 01:00 | -08:00 | PST | Standard time |
| 1952-04-27 03:00 | -07:00 | PDT | Daylight saving time |
| 1952-09-28 01:00 | -08:00 | PST | Standard time |
| 1953-04-26 02:00 | -07:00 | PDT | Daylight saving time |
| 1953-09-27 01:00 | -08:00 | PST | Standard time |
| 1954-04-25 02:00 | -07:00 | PDT | Daylight saving time |
| 1954-09-26 01:00 | -08:00 | PST | Standard time |
| 1955-04-24 02:00 | -07:00 | PDT | Daylight saving time |
| 1955-09-25 01:00 | -08:00 | PST | Standard time |
| 1956-04-29 02:00 | -07:00 | PDT | Daylight saving time |
| 1956-09-30 01:00 | -08:00 | PST | Standard time |
| 1957-04-28 02:00 | -07:00 | PDT | Daylight saving time |
| 1957-09-29 01:00 | -08:00 | PST | Standard time |
| 1958-04-27 02:00 | -07:00 | PDT | Daylight saving time |
| 1958-09-28 01:00 | -08:00 | PST | Standard time |
| 1959-04-26 02:00 | -07:00 | PDT | Daylight saving time |
| 1959-09-27 01:00 | -08:00 | PST | Standard time |
| 1960-04-24 02:00 | -07:00 | PDT | Daylight saving time |
| 1960-09-25 01:00 | -08:00 | PST | Standard time |
| 1961-04-30 02:00 | -07:00 | PDT | Daylight saving time |
| 1961-09-24 01:00 | -08:00 | PST | Standard time |
| 1962-04-29 02:00 | -07:00 | PDT | Daylight saving time |
| 1962-10-28 01:00 | -08:00 | PST | Standard time |
| 1963-04-28 02:00 | -07:00 | PDT | Daylight saving time |
| 1963-10-27 01:00 | -08:00 | PST | Standard time |
| 1964-04-26 02:00 | -07:00 | PDT | Daylight saving time |
| 1964-10-25 01:00 | -08:00 | PST | Standard time |
| 1965-04-25 02:00 | -07:00 | PDT | Daylight saving time |
| 1965-10-31 01:00 | -08:00 | PST | Standard time |
| 1966-04-24 02:00 | -07:00 | PDT | Daylight saving time |
| 1966-10-30 01:00 | -08:00 | PST | Standard time |
| 1967-04-30 03:00 | -07:00 | PDT | Daylight saving time |
| 1967-10-29 01:00 | -08:00 | PST | Standard time |
| 1968-04-28 03:00 | -07:00 | PDT | Daylight saving time |
| 1968-10-27 01:00 | -08:00 | PST | Standard time |
| 1969-04-27 03:00 | -07:00 | PDT | Daylight saving time |
| 1969-10-26 01:00 | -08:00 | PST | Standard time |
| 1970-04-26 03:00 | -07:00 | PDT | Daylight saving time |
| 1970-10-25 01:00 | -08:00 | PST | Standard time |
| 1971-04-25 03:00 | -07:00 | PDT | Daylight saving time |
| 1971-10-31 01:00 | -08:00 | PST | Standard time |
| 1972-04-30 03:00 | -07:00 | PDT | Daylight saving time |
| 1972-10-29 01:00 | -08:00 | PST | Standard time |
| 1973-04-29 03:00 | -07:00 | PDT | Daylight saving time |
| 1973-10-28 01:00 | -08:00 | PST | Standard time |
| 1974-01-06 03:00 | -07:00 | PDT | Daylight saving time |
| 1974-10-27 01:00 | -08:00 | PST | Standard time |
| 1975-02-23 03:00 | -07:00 | PDT | Daylight saving time |
| 1975-10-26 01:00 | -08:00 | PST | Standard time |
| 1976-04-25 03:00 | -07:00 | PDT | Daylight saving time |
| 1976-10-31 01:00 | -08:00 | PST | Standard time |
| 1977-04-24 03:00 | -07:00 | PDT | Daylight saving time |
| 1977-10-30 01:00 | -08:00 | PST | Standard time |
| 1978-04-30 03:00 | -07:00 | PDT | Daylight saving time |
| 1978-10-29 01:00 | -08:00 | PST | Standard time |
| 1979-04-29 03:00 | -07:00 | PDT | Daylight saving time |
| 1979-10-28 01:00 | -08:00 | PST | Standard time |
| 1980-04-27 03:00 | -07:00 | PDT | Daylight saving time |
| 1980-10-26 01:00 | -08:00 | PST | Standard time |
| 1981-04-26 03:00 | -07:00 | PDT | Daylight saving time |
| 1981-10-25 01:00 | -08:00 | PST | Standard time |
| 1982-04-25 03:00 | -07:00 | PDT | Daylight saving time |
| 1982-10-31 01:00 | -08:00 | PST | Standard time |
| 1983-04-24 03:00 | -07:00 | PDT | Daylight saving time |
| 1983-10-30 01:00 | -08:00 | PST | Standard time |
| 1984-04-29 03:00 | -07:00 | PDT | Daylight saving time |
| 1984-10-28 01:00 | -08:00 | PST | Standard time |
| 1985-04-28 03:00 | -07:00 | PDT | Daylight saving time |
| 1985-10-27 01:00 | -08:00 | PST | Standard time |
| 1986-04-27 03:00 | -07:00 | PDT | Daylight saving time |
| 1986-10-26 01:00 | -08:00 | PST | Standard time |
| 1987-04-05 03:00 | -07:00 | PDT | Daylight saving time |
| 1987-10-25 01:00 | -08:00 | PST | Standard time |
| 1988-04-03 03:00 | -07:00 | PDT | Daylight saving time |
| 1988-10-30 01:00 | -08:00 | PST | Standard time |
| 1989-04-02 03:00 | -07:00 | PDT | Daylight saving time |
| 1989-10-29 01:00 | -08:00 | PST | Standard time |
| 1990-04-01 03:00 | -07:00 | PDT | Daylight saving time |
| 1990-10-28 01:00 | -08:00 | PST | Standard time |
| 1991-04-07 03:00 | -07:00 | PDT | Daylight saving time |
| 1991-10-27 01:00 | -08:00 | PST | Standard time |
| 1992-04-05 03:00 | -07:00 | PDT | Daylight saving time |
| 1992-10-25 01:00 | -08:00 | PST | Standard time |
| 1993-04-04 03:00 | -07:00 | PDT | Daylight saving time |
| 1993-10-31 01:00 | -08:00 | PST | Standard time |
| 1994-04-03 03:00 | -07:00 | PDT | Daylight saving time |
| 1994-10-30 01:00 | -08:00 | PST | Standard time |
| 1995-04-02 03:00 | -07:00 | PDT | Daylight saving time |
| 1995-10-29 01:00 | -08:00 | PST | Standard time |
| 1996-04-07 03:00 | -07:00 | PDT | Daylight saving time |
| 1996-10-27 01:00 | -08:00 | PST | Standard time |
| 1997-04-06 03:00 | -07:00 | PDT | Daylight saving time |
| 1997-10-26 01:00 | -08:00 | PST | Standard time |
| 1998-04-05 03:00 | -07:00 | PDT | Daylight saving time |
| 1998-10-25 01:00 | -08:00 | PST | Standard time |
| 1999-04-04 03:00 | -07:00 | PDT | Daylight saving time |
| 1999-10-31 01:00 | -08:00 | PST | Standard time |
| 2000-04-02 03:00 | -07:00 | PDT | Daylight saving time |
| 2000-10-29 01:00 | -08:00 | PST | Standard time |
| 2001-04-01 03:00 | -07:00 | PDT | Daylight saving time |
| 2001-10-28 01:00 | -08:00 | PST | Standard time |
| 2002-04-07 03:00 | -07:00 | PDT | Daylight saving time |
| 2002-10-27 01:00 | -08:00 | PST | Standard time |
| 2003-04-06 03:00 | -07:00 | PDT | Daylight saving time |
| 2003-10-26 01:00 | -08:00 | PST | Standard time |
| 2004-04-04 03:00 | -07:00 | PDT | Daylight saving time |
| 2004-10-31 01:00 | -08:00 | PST | Standard time |
| 2005-04-03 03:00 | -07:00 | PDT | Daylight saving time |
| 2005-10-30 01:00 | -08:00 | PST | Standard time |
| 2006-04-02 03:00 | -07:00 | PDT | Daylight saving time |
| 2006-10-29 01:00 | -08:00 | PST | Standard time |
| 2007-04-01 03:00 | -07:00 | PDT | Daylight saving time |
| 2007-10-28 01:00 | -08:00 | PST | Standard time |
| 2008-04-06 03:00 | -07:00 | PDT | Daylight saving time |
| 2008-10-26 01:00 | -08:00 | PST | Standard time |
| 2009-04-05 03:00 | -07:00 | PDT | Daylight saving time |
| 2009-10-25 01:00 | -08:00 | PST | Standard time |
| 2010-03-14 03:00 | -07:00 | PDT | Daylight saving time |
| 2010-11-07 01:00 | -08:00 | PST | Standard time |
| 2011-03-13 03:00 | -07:00 | PDT | Daylight saving time |
| 2011-11-06 01:00 | -08:00 | PST | Standard time |
| 2012-03-11 03:00 | -07:00 | PDT | Daylight saving time |
| 2012-11-04 01:00 | -08:00 | PST | Standard time |
| 2013-03-10 03:00 | -07:00 | PDT | Daylight saving time |
| 2013-11-03 01:00 | -08:00 | PST | Standard time |
| 2014-03-09 03:00 | -07:00 | PDT | Daylight saving time |
| 2014-11-02 01:00 | -08:00 | PST | Standard time |
| 2015-03-08 03:00 | -07:00 | PDT | Daylight saving time |
| 2015-11-01 01:00 | -08:00 | PST | Standard time |
| 2016-03-13 03:00 | -07:00 | PDT | Daylight saving time |
| 2016-11-06 01:00 | -08:00 | PST | Standard time |
| 2017-03-12 03:00 | -07:00 | PDT | Daylight saving time |
| 2017-11-05 01:00 | -08:00 | PST | Standard time |
| 2018-03-11 03:00 | -07:00 | PDT | Daylight saving time |
| 2018-11-04 01:00 | -08:00 | PST | Standard time |
| 2019-03-10 03:00 | -07:00 | PDT | Daylight saving time |
| 2019-11-03 01:00 | -08:00 | PST | Standard time |
| 2020-03-08 03:00 | -07:00 | PDT | Daylight saving time |
| 2020-11-01 01:00 | -08:00 | PST | Standard time |
| 2021-03-14 03:00 | -07:00 | PDT | Daylight saving time |
| 2021-11-07 01:00 | -08:00 | PST | Standard time |
| 2022-03-13 03:00 | -07:00 | PDT | Daylight saving time |
| 2022-11-06 01:00 | -08:00 | PST | Standard time |
| 2023-03-12 03:00 | -07:00 | PDT | Daylight saving time |
| 2023-11-05 01:00 | -08:00 | PST | Standard time |
| 2024-03-10 03:00 | -07:00 | PDT | Daylight saving time |
| 2024-11-03 01:00 | -08:00 | PST | Standard time |
| 2025-03-09 03:00 | -07:00 | PDT | Daylight saving time |
| 2025-11-02 01:00 | -08:00 | PST | Standard time |
| 2026-03-08 03:00 | -07:00 | PDT | Daylight saving time |
| 2026-11-01 01:00 | -08:00 | PST | Standard time |
| 2027-03-14 03:00 | -07:00 | PDT | Daylight saving time |
| 2027-11-07 01:00 | -08:00 | PST | Standard time |