Historically distinct IANA time zone
America/Halifax
Local time now
ADT · current offset
- Countries
- Canada
- GPS reference
- 44.65° N, 63.60° W
- Data source
- IANA northamerica
- Aliases
- Canada/Atlantic
- Rule groups
- , Canada
CanadaAtlantic - NS (most areas), PE
Geographic context
Where this clock belongs
The map marks the IANA reference location and associated country, not a time-zone boundary.
GPS reference: 44.65° N, 63.60° W. Associated countries: CA.
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
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.
Civil-time record
Recorded changes over time
From 1902 to 2027 · 208 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.
- -04:00 · ASTStandard time applies
- -03:00 · ADTDaylight saving time begins
- -04:00 · ASTStandard time applies
- -03:00 · ADTDaylight saving time begins
- -04:00 · ASTStandard time applies
- -03:00 · ADTDaylight saving time begins
Browse every recorded transition
| Local time after transition | Offset after | Abbreviation | Rule |
|---|---|---|---|
| 1902-06-15 00:14 | -04:00 | AST | Standard time |
| 1916-04-01 01:00 | -03:00 | ADT | Daylight saving time |
| 1916-09-30 23:00 | -04:00 | AST | Standard time |
| 1918-04-14 03:00 | -03:00 | ADT | Daylight saving time |
| 1918-10-27 01:00 | -04:00 | AST | Standard time |
| 1920-05-09 01:00 | -03:00 | ADT | Daylight saving time |
| 1920-08-28 23:00 | -04:00 | AST | Standard time |
| 1921-05-06 01:00 | -03:00 | ADT | Daylight saving time |
| 1921-09-04 23:00 | -04:00 | AST | Standard time |
| 1922-04-30 01:00 | -03:00 | ADT | Daylight saving time |
| 1922-09-04 23:00 | -04:00 | AST | Standard time |
| 1923-05-06 01:00 | -03:00 | ADT | Daylight saving time |
| 1923-09-03 23:00 | -04:00 | AST | Standard time |
| 1924-05-04 01:00 | -03:00 | ADT | Daylight saving time |
| 1924-09-14 23:00 | -04:00 | AST | Standard time |
| 1925-05-03 01:00 | -03:00 | ADT | Daylight saving time |
| 1925-09-27 23:00 | -04:00 | AST | Standard time |
| 1926-05-16 01:00 | -03:00 | ADT | Daylight saving time |
| 1926-09-12 23:00 | -04:00 | AST | Standard time |
| 1927-05-01 01:00 | -03:00 | ADT | Daylight saving time |
| 1927-09-25 23:00 | -04:00 | AST | Standard time |
| 1928-05-13 01:00 | -03:00 | ADT | Daylight saving time |
| 1928-09-08 23:00 | -04:00 | AST | Standard time |
| 1929-05-12 01:00 | -03:00 | ADT | Daylight saving time |
| 1929-09-02 23:00 | -04:00 | AST | Standard time |
| 1930-05-11 01:00 | -03:00 | ADT | Daylight saving time |
| 1930-09-14 23:00 | -04:00 | AST | Standard time |
| 1931-05-10 01:00 | -03:00 | ADT | Daylight saving time |
| 1931-09-27 23:00 | -04:00 | AST | Standard time |
| 1932-05-01 01:00 | -03:00 | ADT | Daylight saving time |
| 1932-09-25 23:00 | -04:00 | AST | Standard time |
| 1933-04-30 01:00 | -03:00 | ADT | Daylight saving time |
| 1933-10-01 23:00 | -04:00 | AST | Standard time |
| 1934-05-20 01:00 | -03:00 | ADT | Daylight saving time |
| 1934-09-15 23:00 | -04:00 | AST | Standard time |
| 1935-06-02 01:00 | -03:00 | ADT | Daylight saving time |
| 1935-09-29 23:00 | -04:00 | AST | Standard time |
| 1936-06-01 01:00 | -03:00 | ADT | Daylight saving time |
| 1936-09-13 23:00 | -04:00 | AST | Standard time |
| 1937-05-02 01:00 | -03:00 | ADT | Daylight saving time |
| 1937-09-26 23:00 | -04:00 | AST | Standard time |
| 1938-05-01 01:00 | -03:00 | ADT | Daylight saving time |
| 1938-09-25 23:00 | -04:00 | AST | Standard time |
| 1939-05-28 01:00 | -03:00 | ADT | Daylight saving time |
| 1939-09-24 23:00 | -04:00 | AST | Standard time |
| 1940-05-05 01:00 | -03:00 | ADT | Daylight saving time |
| 1940-09-29 23:00 | -04:00 | AST | Standard time |
| 1941-05-04 01:00 | -03:00 | ADT | Daylight saving time |
| 1941-09-28 23:00 | -04:00 | AST | Standard time |
| 1942-02-09 03:00 | -03:00 | AWT | Daylight saving time |
| 1945-08-14 20:00 | -03:00 | APT | Daylight saving time |
| 1945-09-30 01:00 | -04:00 | AST | Standard time |
| 1946-04-28 03:00 | -03:00 | ADT | Daylight saving time |
| 1946-09-29 01:00 | -04:00 | AST | Standard time |
| 1947-04-27 03:00 | -03:00 | ADT | Daylight saving time |
| 1947-09-28 01:00 | -04:00 | AST | Standard time |
| 1948-04-25 03:00 | -03:00 | ADT | Daylight saving time |
| 1948-09-26 01:00 | -04:00 | AST | Standard time |
| 1949-04-24 03:00 | -03:00 | ADT | Daylight saving time |
| 1949-09-25 01:00 | -04:00 | AST | Standard time |
| 1951-04-29 03:00 | -03:00 | ADT | Daylight saving time |
| 1951-09-30 01:00 | -04:00 | AST | Standard time |
| 1952-04-27 03:00 | -03:00 | ADT | Daylight saving time |
| 1952-09-28 01:00 | -04:00 | AST | Standard time |
| 1953-04-26 03:00 | -03:00 | ADT | Daylight saving time |
| 1953-09-27 01:00 | -04:00 | AST | Standard time |
| 1954-04-25 03:00 | -03:00 | ADT | Daylight saving time |
| 1954-09-26 01:00 | -04:00 | AST | Standard time |
| 1956-04-29 03:00 | -03:00 | ADT | Daylight saving time |
| 1956-09-30 01:00 | -04:00 | AST | Standard time |
| 1957-04-28 03:00 | -03:00 | ADT | Daylight saving time |
| 1957-09-29 01:00 | -04:00 | AST | Standard time |
| 1958-04-27 03:00 | -03:00 | ADT | Daylight saving time |
| 1958-09-28 01:00 | -04:00 | AST | Standard time |
| 1959-04-26 03:00 | -03:00 | ADT | Daylight saving time |
| 1959-09-27 01:00 | -04:00 | AST | Standard time |
| 1962-04-29 03:00 | -03:00 | ADT | Daylight saving time |
| 1962-10-28 01:00 | -04:00 | AST | Standard time |
| 1963-04-28 03:00 | -03:00 | ADT | Daylight saving time |
| 1963-10-27 01:00 | -04:00 | AST | Standard time |
| 1964-04-26 03:00 | -03:00 | ADT | Daylight saving time |
| 1964-10-25 01:00 | -04:00 | AST | Standard time |
| 1965-04-25 03:00 | -03:00 | ADT | Daylight saving time |
| 1965-10-31 01:00 | -04:00 | AST | Standard time |
| 1966-04-24 03:00 | -03:00 | ADT | Daylight saving time |
| 1966-10-30 01:00 | -04:00 | AST | Standard time |
| 1967-04-30 03:00 | -03:00 | ADT | Daylight saving time |
| 1967-10-29 01:00 | -04:00 | AST | Standard time |
| 1968-04-28 03:00 | -03:00 | ADT | Daylight saving time |
| 1968-10-27 01:00 | -04:00 | AST | Standard time |
| 1969-04-27 03:00 | -03:00 | ADT | Daylight saving time |
| 1969-10-26 01:00 | -04:00 | AST | Standard time |
| 1970-04-26 03:00 | -03:00 | ADT | Daylight saving time |
| 1970-10-25 01:00 | -04:00 | AST | Standard time |
| 1971-04-25 03:00 | -03:00 | ADT | Daylight saving time |
| 1971-10-31 01:00 | -04:00 | AST | Standard time |
| 1972-04-30 03:00 | -03:00 | ADT | Daylight saving time |
| 1972-10-29 01:00 | -04:00 | AST | Standard time |
| 1973-04-29 03:00 | -03:00 | ADT | Daylight saving time |
| 1973-10-28 01:00 | -04:00 | AST | Standard time |
| 1974-04-28 03:00 | -03:00 | ADT | Daylight saving time |
| 1974-10-27 01:00 | -04:00 | AST | Standard time |
| 1975-04-27 03:00 | -03:00 | ADT | Daylight saving time |
| 1975-10-26 01:00 | -04:00 | AST | Standard time |
| 1976-04-25 03:00 | -03:00 | ADT | Daylight saving time |
| 1976-10-31 01:00 | -04:00 | AST | Standard time |
| 1977-04-24 03:00 | -03:00 | ADT | Daylight saving time |
| 1977-10-30 01:00 | -04:00 | AST | Standard time |
| 1978-04-30 03:00 | -03:00 | ADT | Daylight saving time |
| 1978-10-29 01:00 | -04:00 | AST | Standard time |
| 1979-04-29 03:00 | -03:00 | ADT | Daylight saving time |
| 1979-10-28 01:00 | -04:00 | AST | Standard time |
| 1980-04-27 03:00 | -03:00 | ADT | Daylight saving time |
| 1980-10-26 01:00 | -04:00 | AST | Standard time |
| 1981-04-26 03:00 | -03:00 | ADT | Daylight saving time |
| 1981-10-25 01:00 | -04:00 | AST | Standard time |
| 1982-04-25 03:00 | -03:00 | ADT | Daylight saving time |
| 1982-10-31 01:00 | -04:00 | AST | Standard time |
| 1983-04-24 03:00 | -03:00 | ADT | Daylight saving time |
| 1983-10-30 01:00 | -04:00 | AST | Standard time |
| 1984-04-29 03:00 | -03:00 | ADT | Daylight saving time |
| 1984-10-28 01:00 | -04:00 | AST | Standard time |
| 1985-04-28 03:00 | -03:00 | ADT | Daylight saving time |
| 1985-10-27 01:00 | -04:00 | AST | Standard time |
| 1986-04-27 03:00 | -03:00 | ADT | Daylight saving time |
| 1986-10-26 01:00 | -04:00 | AST | Standard time |
| 1987-04-05 03:00 | -03:00 | ADT | Daylight saving time |
| 1987-10-25 01:00 | -04:00 | AST | Standard time |
| 1988-04-03 03:00 | -03:00 | ADT | Daylight saving time |
| 1988-10-30 01:00 | -04:00 | AST | Standard time |
| 1989-04-02 03:00 | -03:00 | ADT | Daylight saving time |
| 1989-10-29 01:00 | -04:00 | AST | Standard time |
| 1990-04-01 03:00 | -03:00 | ADT | Daylight saving time |
| 1990-10-28 01:00 | -04:00 | AST | Standard time |
| 1991-04-07 03:00 | -03:00 | ADT | Daylight saving time |
| 1991-10-27 01:00 | -04:00 | AST | Standard time |
| 1992-04-05 03:00 | -03:00 | ADT | Daylight saving time |
| 1992-10-25 01:00 | -04:00 | AST | Standard time |
| 1993-04-04 03:00 | -03:00 | ADT | Daylight saving time |
| 1993-10-31 01:00 | -04:00 | AST | Standard time |
| 1994-04-03 03:00 | -03:00 | ADT | Daylight saving time |
| 1994-10-30 01:00 | -04:00 | AST | Standard time |
| 1995-04-02 03:00 | -03:00 | ADT | Daylight saving time |
| 1995-10-29 01:00 | -04:00 | AST | Standard time |
| 1996-04-07 03:00 | -03:00 | ADT | Daylight saving time |
| 1996-10-27 01:00 | -04:00 | AST | Standard time |
| 1997-04-06 03:00 | -03:00 | ADT | Daylight saving time |
| 1997-10-26 01:00 | -04:00 | AST | Standard time |
| 1998-04-05 03:00 | -03:00 | ADT | Daylight saving time |
| 1998-10-25 01:00 | -04:00 | AST | Standard time |
| 1999-04-04 03:00 | -03:00 | ADT | Daylight saving time |
| 1999-10-31 01:00 | -04:00 | AST | Standard time |
| 2000-04-02 03:00 | -03:00 | ADT | Daylight saving time |
| 2000-10-29 01:00 | -04:00 | AST | Standard time |
| 2001-04-01 03:00 | -03:00 | ADT | Daylight saving time |
| 2001-10-28 01:00 | -04:00 | AST | Standard time |
| 2002-04-07 03:00 | -03:00 | ADT | Daylight saving time |
| 2002-10-27 01:00 | -04:00 | AST | Standard time |
| 2003-04-06 03:00 | -03:00 | ADT | Daylight saving time |
| 2003-10-26 01:00 | -04:00 | AST | Standard time |
| 2004-04-04 03:00 | -03:00 | ADT | Daylight saving time |
| 2004-10-31 01:00 | -04:00 | AST | Standard time |
| 2005-04-03 03:00 | -03:00 | ADT | Daylight saving time |
| 2005-10-30 01:00 | -04:00 | AST | Standard time |
| 2006-04-02 03:00 | -03:00 | ADT | Daylight saving time |
| 2006-10-29 01:00 | -04:00 | AST | Standard time |
| 2007-03-11 03:00 | -03:00 | ADT | Daylight saving time |
| 2007-11-04 01:00 | -04:00 | AST | Standard time |
| 2008-03-09 03:00 | -03:00 | ADT | Daylight saving time |
| 2008-11-02 01:00 | -04:00 | AST | Standard time |
| 2009-03-08 03:00 | -03:00 | ADT | Daylight saving time |
| 2009-11-01 01:00 | -04:00 | AST | Standard time |
| 2010-03-14 03:00 | -03:00 | ADT | Daylight saving time |
| 2010-11-07 01:00 | -04:00 | AST | Standard time |
| 2011-03-13 03:00 | -03:00 | ADT | Daylight saving time |
| 2011-11-06 01:00 | -04:00 | AST | Standard time |
| 2012-03-11 03:00 | -03:00 | ADT | Daylight saving time |
| 2012-11-04 01:00 | -04:00 | AST | Standard time |
| 2013-03-10 03:00 | -03:00 | ADT | Daylight saving time |
| 2013-11-03 01:00 | -04:00 | AST | Standard time |
| 2014-03-09 03:00 | -03:00 | ADT | Daylight saving time |
| 2014-11-02 01:00 | -04:00 | AST | Standard time |
| 2015-03-08 03:00 | -03:00 | ADT | Daylight saving time |
| 2015-11-01 01:00 | -04:00 | AST | Standard time |
| 2016-03-13 03:00 | -03:00 | ADT | Daylight saving time |
| 2016-11-06 01:00 | -04:00 | AST | Standard time |
| 2017-03-12 03:00 | -03:00 | ADT | Daylight saving time |
| 2017-11-05 01:00 | -04:00 | AST | Standard time |
| 2018-03-11 03:00 | -03:00 | ADT | Daylight saving time |
| 2018-11-04 01:00 | -04:00 | AST | Standard time |
| 2019-03-10 03:00 | -03:00 | ADT | Daylight saving time |
| 2019-11-03 01:00 | -04:00 | AST | Standard time |
| 2020-03-08 03:00 | -03:00 | ADT | Daylight saving time |
| 2020-11-01 01:00 | -04:00 | AST | Standard time |
| 2021-03-14 03:00 | -03:00 | ADT | Daylight saving time |
| 2021-11-07 01:00 | -04:00 | AST | Standard time |
| 2022-03-13 03:00 | -03:00 | ADT | Daylight saving time |
| 2022-11-06 01:00 | -04:00 | AST | Standard time |
| 2023-03-12 03:00 | -03:00 | ADT | Daylight saving time |
| 2023-11-05 01:00 | -04:00 | AST | Standard time |
| 2024-03-10 03:00 | -03:00 | ADT | Daylight saving time |
| 2024-11-03 01:00 | -04:00 | AST | Standard time |
| 2025-03-09 03:00 | -03:00 | ADT | Daylight saving time |
| 2025-11-02 01:00 | -04:00 | AST | Standard time |
| 2026-03-08 03:00 | -03:00 | ADT | Daylight saving time |
| 2026-11-01 01:00 | -04:00 | AST | Standard time |
| 2027-03-14 03:00 | -03:00 | ADT | Daylight saving time |
| 2027-11-07 01:00 | -04:00 | AST | Standard time |