Historically distinct IANA time zone
America/Detroit
- Countries
- United States of America
- GPS reference
- 42.33° N, 83.05° W
- Data source
- IANA northamerica
- Aliases
- US/Michigan
United States of AmericaEastern - MI (most areas)
Geographic context
Where this clock belongs
The map marks the IANA reference location and associated country, not a time-zone boundary.
GPS reference: 42.33° N, 83.05° W. Associated countries: US.
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
Peace
Michigan Michigan didn't observe DST from 1968 to 1973. The tzdata source notes that Michigan started using standard time on 1885-09-18, but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) that Detroit kept local time until 1900 when the City Council decreed that clocks should be put back twenty-eight minutes to Central Standard Time. Half the city obeyed, half refused. After considerable debate, the decision was rescinded and the city reverted to Sun time. A derisive offer to erect a sundial in front of the city hall was referred to the Committee on Sewers. Then, in 1905, Central time was adopted by city vote. This story is too entertaining to be false, so go with Howse over Shanks. Garland (1927) writes "Cleveland and Detroit advanced their clocks one hour in 1914." This change is not in Shanks. We have no more info, so omit this for now. Due to a complicated set of legal maneuvers, in 1967 Michigan did not start daylight saving time when the rest of the US did. Instead, it began DST on Jun 14 at 00:01. This was big news: the Detroit Free Press reported it at the top of Page 1 on 1967-06-14, in an article "State Adjusting to Switch to Fast Time" by Gary Blonston, above an article about Thurgood Marshall's confirmation to the US Supreme Court. Although Shanks says Detroit observed DST until 1967-10-29 00:01, that time of day seems to be incorrect, as the Free Press later said DST ended in Michigan at the same time as the rest of the US. Also, although Shanks reports no DST in Detroit in 1968, it did observe DST that year; in the November 1968 election Michigan voters narrowly repealed DST, effective 1969. Most of Michigan observed DST from 1973 on, but was a bit late in 1975.
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.
- America/Indiana/WinamacUnited States of America · 328 km from the reference location · Same annual clock since 2008
- America/TorontoCanada · 332 km from the reference location · Same annual clock since 1975
- America/Indiana/IndianapolisUnited States of America · 386 km from the reference location · Same annual clock since 2006
Canada · 332 km from the reference location · Same annual clock since 1975Civil-time record
Recorded changes over time
From 1904 to 2027 · 121 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.
- -06:00 · CSTStandard time applies
- -05:00 · ESTStandard time applies
- -04:00 · EWTDaylight saving time begins
- -04:00 · EPTDaylight saving time begins
- -05:00 · ESTStandard time applies
- -04:00 · EDTDaylight saving time begins
Browse every recorded transition
| Local time after transition | Offset after | Abbreviation | Rule |
|---|---|---|---|
| 1904-12-31 23:32 | -06:00 | CST | Standard time |
| 1915-05-15 03:00 | -05:00 | EST | Standard time |
| 1942-02-09 03:00 | -04:00 | EWT | Daylight saving time |
| 1945-08-14 19:00 | -04:00 | EPT | Daylight saving time |
| 1945-09-30 01:00 | -05:00 | EST | Standard time |
| 1948-04-25 03:00 | -04:00 | EDT | Daylight saving time |
| 1948-09-26 01:00 | -05:00 | EST | Standard time |
| 1967-06-14 01:01 | -04:00 | EDT | Daylight saving time |
| 1967-10-29 01:00 | -05:00 | EST | Standard time |
| 1968-04-28 03:00 | -04:00 | EDT | Daylight saving time |
| 1968-10-27 01:00 | -05:00 | EST | Standard time |
| 1973-04-29 03:00 | -04:00 | EDT | Daylight saving time |
| 1973-10-28 01:00 | -05:00 | EST | Standard time |
| 1974-01-06 03:00 | -04:00 | EDT | Daylight saving time |
| 1974-10-27 01:00 | -05:00 | EST | Standard time |
| 1975-04-27 03:00 | -04:00 | EDT | Daylight saving time |
| 1975-10-26 01:00 | -05:00 | EST | Standard time |
| 1976-04-25 03:00 | -04:00 | EDT | Daylight saving time |
| 1976-10-31 01:00 | -05:00 | EST | Standard time |
| 1977-04-24 03:00 | -04:00 | EDT | Daylight saving time |
| 1977-10-30 01:00 | -05:00 | EST | Standard time |
| 1978-04-30 03:00 | -04:00 | EDT | Daylight saving time |
| 1978-10-29 01:00 | -05:00 | EST | Standard time |
| 1979-04-29 03:00 | -04:00 | EDT | Daylight saving time |
| 1979-10-28 01:00 | -05:00 | EST | Standard time |
| 1980-04-27 03:00 | -04:00 | EDT | Daylight saving time |
| 1980-10-26 01:00 | -05:00 | EST | Standard time |
| 1981-04-26 03:00 | -04:00 | EDT | Daylight saving time |
| 1981-10-25 01:00 | -05:00 | EST | Standard time |
| 1982-04-25 03:00 | -04:00 | EDT | Daylight saving time |
| 1982-10-31 01:00 | -05:00 | EST | Standard time |
| 1983-04-24 03:00 | -04:00 | EDT | Daylight saving time |
| 1983-10-30 01:00 | -05:00 | EST | Standard time |
| 1984-04-29 03:00 | -04:00 | EDT | Daylight saving time |
| 1984-10-28 01:00 | -05:00 | EST | Standard time |
| 1985-04-28 03:00 | -04:00 | EDT | Daylight saving time |
| 1985-10-27 01:00 | -05:00 | EST | Standard time |
| 1986-04-27 03:00 | -04:00 | EDT | Daylight saving time |
| 1986-10-26 01:00 | -05:00 | EST | Standard time |
| 1987-04-05 03:00 | -04:00 | EDT | Daylight saving time |
| 1987-10-25 01:00 | -05:00 | EST | Standard time |
| 1988-04-03 03:00 | -04:00 | EDT | Daylight saving time |
| 1988-10-30 01:00 | -05:00 | EST | Standard time |
| 1989-04-02 03:00 | -04:00 | EDT | Daylight saving time |
| 1989-10-29 01:00 | -05:00 | EST | Standard time |
| 1990-04-01 03:00 | -04:00 | EDT | Daylight saving time |
| 1990-10-28 01:00 | -05:00 | EST | Standard time |
| 1991-04-07 03:00 | -04:00 | EDT | Daylight saving time |
| 1991-10-27 01:00 | -05:00 | EST | Standard time |
| 1992-04-05 03:00 | -04:00 | EDT | Daylight saving time |
| 1992-10-25 01:00 | -05:00 | EST | Standard time |
| 1993-04-04 03:00 | -04:00 | EDT | Daylight saving time |
| 1993-10-31 01:00 | -05:00 | EST | Standard time |
| 1994-04-03 03:00 | -04:00 | EDT | Daylight saving time |
| 1994-10-30 01:00 | -05:00 | EST | Standard time |
| 1995-04-02 03:00 | -04:00 | EDT | Daylight saving time |
| 1995-10-29 01:00 | -05:00 | EST | Standard time |
| 1996-04-07 03:00 | -04:00 | EDT | Daylight saving time |
| 1996-10-27 01:00 | -05:00 | EST | Standard time |
| 1997-04-06 03:00 | -04:00 | EDT | Daylight saving time |
| 1997-10-26 01:00 | -05:00 | EST | Standard time |
| 1998-04-05 03:00 | -04:00 | EDT | Daylight saving time |
| 1998-10-25 01:00 | -05:00 | EST | Standard time |
| 1999-04-04 03:00 | -04:00 | EDT | Daylight saving time |
| 1999-10-31 01:00 | -05:00 | EST | Standard time |
| 2000-04-02 03:00 | -04:00 | EDT | Daylight saving time |
| 2000-10-29 01:00 | -05:00 | EST | Standard time |
| 2001-04-01 03:00 | -04:00 | EDT | Daylight saving time |
| 2001-10-28 01:00 | -05:00 | EST | Standard time |
| 2002-04-07 03:00 | -04:00 | EDT | Daylight saving time |
| 2002-10-27 01:00 | -05:00 | EST | Standard time |
| 2003-04-06 03:00 | -04:00 | EDT | Daylight saving time |
| 2003-10-26 01:00 | -05:00 | EST | Standard time |
| 2004-04-04 03:00 | -04:00 | EDT | Daylight saving time |
| 2004-10-31 01:00 | -05:00 | EST | Standard time |
| 2005-04-03 03:00 | -04:00 | EDT | Daylight saving time |
| 2005-10-30 01:00 | -05:00 | EST | Standard time |
| 2006-04-02 03:00 | -04:00 | EDT | Daylight saving time |
| 2006-10-29 01:00 | -05:00 | EST | Standard time |
| 2007-03-11 03:00 | -04:00 | EDT | Daylight saving time |
| 2007-11-04 01:00 | -05:00 | EST | Standard time |
| 2008-03-09 03:00 | -04:00 | EDT | Daylight saving time |
| 2008-11-02 01:00 | -05:00 | EST | Standard time |
| 2009-03-08 03:00 | -04:00 | EDT | Daylight saving time |
| 2009-11-01 01:00 | -05:00 | EST | Standard time |
| 2010-03-14 03:00 | -04:00 | EDT | Daylight saving time |
| 2010-11-07 01:00 | -05:00 | EST | Standard time |
| 2011-03-13 03:00 | -04:00 | EDT | Daylight saving time |
| 2011-11-06 01:00 | -05:00 | EST | Standard time |
| 2012-03-11 03:00 | -04:00 | EDT | Daylight saving time |
| 2012-11-04 01:00 | -05:00 | EST | Standard time |
| 2013-03-10 03:00 | -04:00 | EDT | Daylight saving time |
| 2013-11-03 01:00 | -05:00 | EST | Standard time |
| 2014-03-09 03:00 | -04:00 | EDT | Daylight saving time |
| 2014-11-02 01:00 | -05:00 | EST | Standard time |
| 2015-03-08 03:00 | -04:00 | EDT | Daylight saving time |
| 2015-11-01 01:00 | -05:00 | EST | Standard time |
| 2016-03-13 03:00 | -04:00 | EDT | Daylight saving time |
| 2016-11-06 01:00 | -05:00 | EST | Standard time |
| 2017-03-12 03:00 | -04:00 | EDT | Daylight saving time |
| 2017-11-05 01:00 | -05:00 | EST | Standard time |
| 2018-03-11 03:00 | -04:00 | EDT | Daylight saving time |
| 2018-11-04 01:00 | -05:00 | EST | Standard time |
| 2019-03-10 03:00 | -04:00 | EDT | Daylight saving time |
| 2019-11-03 01:00 | -05:00 | EST | Standard time |
| 2020-03-08 03:00 | -04:00 | EDT | Daylight saving time |
| 2020-11-01 01:00 | -05:00 | EST | Standard time |
| 2021-03-14 03:00 | -04:00 | EDT | Daylight saving time |
| 2021-11-07 01:00 | -05:00 | EST | Standard time |
| 2022-03-13 03:00 | -04:00 | EDT | Daylight saving time |
| 2022-11-06 01:00 | -05:00 | EST | Standard time |
| 2023-03-12 03:00 | -04:00 | EDT | Daylight saving time |
| 2023-11-05 01:00 | -05:00 | EST | Standard time |
| 2024-03-10 03:00 | -04:00 | EDT | Daylight saving time |
| 2024-11-03 01:00 | -05:00 | EST | Standard time |
| 2025-03-09 03:00 | -04:00 | EDT | Daylight saving time |
| 2025-11-02 01:00 | -05:00 | EST | Standard time |
| 2026-03-08 03:00 | -04:00 | EDT | Daylight saving time |
| 2026-11-01 01:00 | -05:00 | EST | Standard time |
| 2027-03-14 03:00 | -04:00 | EDT | Daylight saving time |
| 2027-11-07 01:00 | -05:00 | EST | Standard time |