Atlantic/Madeira

Time zone identifier: Atlantic/Madeira

Current civil offset: +00:00 (WET)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1884-01-01

Local Mean Time (LMT): -01:07:36 based on geographic meridian

Total recorded transitions: 214 transitions across 4 distinct offsets

Associated countries: PT

Historical Offset Step Chart (1880 to Present)

Text summary: Atlantic/Madeira shifted between 4 distinct offsets from 1884-01-01 through the modern era.

Complete Transition History (214 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1884-01-01T01:07:36Z`	`1884-01-01 00:00:00`	-01:07:36 → -01:07:36	`FMT`	No	offset-only
`1912-01-01T01:00:00Z`	`1912-01-01 00:00:00`	-01:07:36 → -01:00	`-01`	No	gap
`1916-06-18T00:00:00Z`	`1916-06-18 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1916-11-01T01:00:00Z`	`1916-11-01 00:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1917-03-01T01:00:00Z`	`1917-03-01 01:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1917-10-15T00:00:00Z`	`1917-10-14 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1918-03-01T01:00:00Z`	`1918-03-01 01:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1918-10-15T00:00:00Z`	`1918-10-14 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1919-03-01T01:00:00Z`	`1919-03-01 01:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1919-10-15T00:00:00Z`	`1919-10-14 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1920-03-01T01:00:00Z`	`1920-03-01 01:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1920-10-15T00:00:00Z`	`1920-10-14 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1921-03-01T01:00:00Z`	`1921-03-01 01:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1921-10-15T00:00:00Z`	`1921-10-14 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1924-04-17T00:00:00Z`	`1924-04-17 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1924-10-05T00:00:00Z`	`1924-10-04 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1926-04-18T00:00:00Z`	`1926-04-18 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1926-10-03T00:00:00Z`	`1926-10-02 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1927-04-10T00:00:00Z`	`1927-04-10 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1927-10-02T00:00:00Z`	`1927-10-01 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1928-04-15T00:00:00Z`	`1928-04-15 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1928-10-07T00:00:00Z`	`1928-10-06 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1929-04-21T00:00:00Z`	`1929-04-21 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1929-10-06T00:00:00Z`	`1929-10-05 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1931-04-19T00:00:00Z`	`1931-04-19 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1931-10-04T00:00:00Z`	`1931-10-03 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1932-04-03T00:00:00Z`	`1932-04-03 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1932-10-02T00:00:00Z`	`1932-10-01 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1934-04-08T00:00:00Z`	`1934-04-08 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1934-10-07T00:00:00Z`	`1934-10-06 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1935-03-31T00:00:00Z`	`1935-03-31 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1935-10-06T00:00:00Z`	`1935-10-05 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1936-04-19T00:00:00Z`	`1936-04-19 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1936-10-04T00:00:00Z`	`1936-10-03 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1937-04-04T00:00:00Z`	`1937-04-04 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1937-10-03T00:00:00Z`	`1937-10-02 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1938-03-27T00:00:00Z`	`1938-03-27 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1938-10-02T00:00:00Z`	`1938-10-01 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1939-04-16T00:00:00Z`	`1939-04-16 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1939-11-19T00:00:00Z`	`1939-11-18 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1940-02-25T00:00:00Z`	`1940-02-25 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1940-10-08T00:00:00Z`	`1940-10-07 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1941-04-06T00:00:00Z`	`1941-04-06 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1941-10-06T00:00:00Z`	`1941-10-05 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1942-03-15T00:00:00Z`	`1942-03-15 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1942-04-25T23:00:00Z`	`1942-04-26 00:00:00`	+00:00 → +01:00	`+01`	Yes	gap
`1942-08-15T23:00:00Z`	`1942-08-15 23:00:00`	+01:00 → +00:00	`+00`	Yes	overlap
`1942-10-25T00:00:00Z`	`1942-10-24 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1943-03-14T00:00:00Z`	`1943-03-14 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1943-04-17T23:00:00Z`	`1943-04-18 00:00:00`	+00:00 → +01:00	`+01`	Yes	gap
`1943-08-28T23:00:00Z`	`1943-08-28 23:00:00`	+01:00 → +00:00	`+00`	Yes	overlap
`1943-10-31T00:00:00Z`	`1943-10-30 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1944-03-12T00:00:00Z`	`1944-03-12 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1944-04-22T23:00:00Z`	`1944-04-23 00:00:00`	+00:00 → +01:00	`+01`	Yes	gap
`1944-08-26T23:00:00Z`	`1944-08-26 23:00:00`	+01:00 → +00:00	`+00`	Yes	overlap
`1944-10-29T00:00:00Z`	`1944-10-28 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1945-03-11T00:00:00Z`	`1945-03-11 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1945-04-21T23:00:00Z`	`1945-04-22 00:00:00`	+00:00 → +01:00	`+01`	Yes	gap
`1945-08-25T23:00:00Z`	`1945-08-25 23:00:00`	+01:00 → +00:00	`+00`	Yes	overlap
`1945-10-28T00:00:00Z`	`1945-10-27 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1946-04-07T00:00:00Z`	`1946-04-07 00:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1946-10-06T00:00:00Z`	`1946-10-05 23:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1947-04-06T03:00:00Z`	`1947-04-06 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1947-10-05T03:00:00Z`	`1947-10-05 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1948-04-04T03:00:00Z`	`1948-04-04 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1948-10-03T03:00:00Z`	`1948-10-03 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1949-04-03T03:00:00Z`	`1949-04-03 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1949-10-02T03:00:00Z`	`1949-10-02 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1950-04-02T03:00:00Z`	`1950-04-02 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1950-10-01T03:00:00Z`	`1950-10-01 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1951-04-01T03:00:00Z`	`1951-04-01 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1951-10-07T03:00:00Z`	`1951-10-07 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1952-04-06T03:00:00Z`	`1952-04-06 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1952-10-05T03:00:00Z`	`1952-10-05 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1953-04-05T03:00:00Z`	`1953-04-05 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1953-10-04T03:00:00Z`	`1953-10-04 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1954-04-04T03:00:00Z`	`1954-04-04 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1954-10-03T03:00:00Z`	`1954-10-03 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1955-04-03T03:00:00Z`	`1955-04-03 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1955-10-02T03:00:00Z`	`1955-10-02 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1956-04-01T03:00:00Z`	`1956-04-01 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1956-10-07T03:00:00Z`	`1956-10-07 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1957-04-07T03:00:00Z`	`1957-04-07 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1957-10-06T03:00:00Z`	`1957-10-06 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1958-04-06T03:00:00Z`	`1958-04-06 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1958-10-05T03:00:00Z`	`1958-10-05 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1959-04-05T03:00:00Z`	`1959-04-05 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1959-10-04T03:00:00Z`	`1959-10-04 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1960-04-03T03:00:00Z`	`1960-04-03 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1960-10-02T03:00:00Z`	`1960-10-02 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1961-04-02T03:00:00Z`	`1961-04-02 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1961-10-01T03:00:00Z`	`1961-10-01 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1962-04-01T03:00:00Z`	`1962-04-01 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1962-10-07T03:00:00Z`	`1962-10-07 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1963-04-07T03:00:00Z`	`1963-04-07 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1963-10-06T03:00:00Z`	`1963-10-06 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1964-04-05T03:00:00Z`	`1964-04-05 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1964-10-04T03:00:00Z`	`1964-10-04 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1965-04-04T03:00:00Z`	`1965-04-04 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1965-10-03T03:00:00Z`	`1965-10-03 02:00:00`	+00:00 → -01:00	`-01`	No	overlap
`1966-04-03T03:00:00Z`	`1966-04-03 03:00:00`	-01:00 → +00:00	`+00`	Yes	gap
`1966-10-02T03:00:00Z`	`1966-10-02 03:00:00`	+00:00 → +00:00	`WET`	No	offset-only
`1982-04-04T00:00:00Z`	`1982-04-04 01:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1982-09-26T00:00:00Z`	`1982-09-26 00:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1983-03-27T00:00:00Z`	`1983-03-27 01:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1983-09-25T00:00:00Z`	`1983-09-25 00:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1984-03-25T00:00:00Z`	`1984-03-25 01:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1984-09-30T00:00:00Z`	`1984-09-30 00:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1985-03-31T00:00:00Z`	`1985-03-31 01:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1985-09-29T00:00:00Z`	`1985-09-29 00:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1986-03-30T00:00:00Z`	`1986-03-30 01:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1986-09-28T01:00:00Z`	`1986-09-28 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1987-03-29T01:00:00Z`	`1987-03-29 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1987-09-27T01:00:00Z`	`1987-09-27 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1988-03-27T01:00:00Z`	`1988-03-27 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1988-09-25T01:00:00Z`	`1988-09-25 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1989-03-26T01:00:00Z`	`1989-03-26 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1989-09-24T01:00:00Z`	`1989-09-24 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1990-03-25T01:00:00Z`	`1990-03-25 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1990-09-30T01:00:00Z`	`1990-09-30 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1991-03-31T01:00:00Z`	`1991-03-31 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1991-09-29T01:00:00Z`	`1991-09-29 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1992-03-29T01:00:00Z`	`1992-03-29 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1992-09-27T01:00:00Z`	`1992-09-27 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1993-03-28T01:00:00Z`	`1993-03-28 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1993-09-26T01:00:00Z`	`1993-09-26 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1994-03-27T01:00:00Z`	`1994-03-27 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1994-09-25T01:00:00Z`	`1994-09-25 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1995-03-26T01:00:00Z`	`1995-03-26 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1995-09-24T01:00:00Z`	`1995-09-24 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1996-03-31T01:00:00Z`	`1996-03-31 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1996-10-27T01:00:00Z`	`1996-10-27 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1997-03-30T01:00:00Z`	`1997-03-30 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1997-10-26T01:00:00Z`	`1997-10-26 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1998-03-29T01:00:00Z`	`1998-03-29 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1998-10-25T01:00:00Z`	`1998-10-25 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1999-03-28T01:00:00Z`	`1999-03-28 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1999-10-31T01:00:00Z`	`1999-10-31 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2000-03-26T01:00:00Z`	`2000-03-26 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2000-10-29T01:00:00Z`	`2000-10-29 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2001-03-25T01:00:00Z`	`2001-03-25 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2001-10-28T01:00:00Z`	`2001-10-28 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2002-03-31T01:00:00Z`	`2002-03-31 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2002-10-27T01:00:00Z`	`2002-10-27 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2003-03-30T01:00:00Z`	`2003-03-30 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2003-10-26T01:00:00Z`	`2003-10-26 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2004-03-28T01:00:00Z`	`2004-03-28 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2004-10-31T01:00:00Z`	`2004-10-31 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2005-03-27T01:00:00Z`	`2005-03-27 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2005-10-30T01:00:00Z`	`2005-10-30 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2006-03-26T01:00:00Z`	`2006-03-26 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2006-10-29T01:00:00Z`	`2006-10-29 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2007-03-25T01:00:00Z`	`2007-03-25 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2007-10-28T01:00:00Z`	`2007-10-28 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2008-03-30T01:00:00Z`	`2008-03-30 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2008-10-26T01:00:00Z`	`2008-10-26 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2009-03-29T01:00:00Z`	`2009-03-29 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2009-10-25T01:00:00Z`	`2009-10-25 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2010-03-28T01:00:00Z`	`2010-03-28 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2010-10-31T01:00:00Z`	`2010-10-31 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2011-03-27T01:00:00Z`	`2011-03-27 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2011-10-30T01:00:00Z`	`2011-10-30 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2012-03-25T01:00:00Z`	`2012-03-25 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2012-10-28T01:00:00Z`	`2012-10-28 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2013-03-31T01:00:00Z`	`2013-03-31 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2013-10-27T01:00:00Z`	`2013-10-27 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2014-03-30T01:00:00Z`	`2014-03-30 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2014-10-26T01:00:00Z`	`2014-10-26 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2015-03-29T01:00:00Z`	`2015-03-29 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2015-10-25T01:00:00Z`	`2015-10-25 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2016-03-27T01:00:00Z`	`2016-03-27 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2016-10-30T01:00:00Z`	`2016-10-30 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2017-03-26T01:00:00Z`	`2017-03-26 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2017-10-29T01:00:00Z`	`2017-10-29 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2018-03-25T01:00:00Z`	`2018-03-25 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2018-10-28T01:00:00Z`	`2018-10-28 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2019-03-31T01:00:00Z`	`2019-03-31 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2019-10-27T01:00:00Z`	`2019-10-27 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2020-03-29T01:00:00Z`	`2020-03-29 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2020-10-25T01:00:00Z`	`2020-10-25 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2021-03-28T01:00:00Z`	`2021-03-28 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2021-10-31T01:00:00Z`	`2021-10-31 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2022-03-27T01:00:00Z`	`2022-03-27 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2022-10-30T01:00:00Z`	`2022-10-30 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2023-03-26T01:00:00Z`	`2023-03-26 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2023-10-29T01:00:00Z`	`2023-10-29 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2024-03-31T01:00:00Z`	`2024-03-31 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2024-10-27T01:00:00Z`	`2024-10-27 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2025-03-30T01:00:00Z`	`2025-03-30 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2025-10-26T01:00:00Z`	`2025-10-26 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2026-03-29T01:00:00Z`	`2026-03-29 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2026-10-25T01:00:00Z`	`2026-10-25 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2027-03-28T01:00:00Z`	`2027-03-28 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2027-10-31T01:00:00Z`	`2027-10-31 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2028-03-26T01:00:00Z`	`2028-03-26 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2028-10-29T01:00:00Z`	`2028-10-29 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2029-03-25T01:00:00Z`	`2029-03-25 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2029-10-28T01:00:00Z`	`2029-10-28 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2030-03-31T01:00:00Z`	`2030-03-31 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2030-10-27T01:00:00Z`	`2030-10-27 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2031-03-30T01:00:00Z`	`2031-03-30 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2031-10-26T01:00:00Z`	`2031-10-26 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2032-03-28T01:00:00Z`	`2032-03-28 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2032-10-31T01:00:00Z`	`2032-10-31 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2033-03-27T01:00:00Z`	`2033-03-27 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2033-10-30T01:00:00Z`	`2033-10-30 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2034-03-26T01:00:00Z`	`2034-03-26 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2034-10-29T01:00:00Z`	`2034-10-29 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2035-03-25T01:00:00Z`	`2035-03-25 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2035-10-28T01:00:00Z`	`2035-10-28 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2036-03-30T01:00:00Z`	`2036-03-30 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2036-10-26T01:00:00Z`	`2036-10-26 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`2037-03-29T01:00:00Z`	`2037-03-29 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`2037-10-25T01:00:00Z`	`2037-10-25 01:00:00`	+01:00 → +00:00	`WET`	No	overlap

Notes from the Maintainers

Source: europe (Lines 2396 to 2446)

Vanguard section, for zic and other parsers that support %z.
From Tim Parenti (2024-07-01):
While Decreto-Lei 309/76 of 1976-04-27 reintroduced DST on the mainland by
falling back on 1976-09-26, it assigned the Permanent Time Commission to
study and propose revisions for the Azores and Madeira.  Decreto Regional
9/77/A of 1977-05-17 affirmed that "the legal time remained unchanged in the
Azores" at UT-1, and would remain there year-round.
https://dre.pt/dr/detalhe/decreto-regional/9-1977-252066

Decreto Regional 2/82/A, published 1982-03-02, adopted DST in the same
fashion as the mainland used at the time.
https://dre.pt/dr/detalhe/decreto-regional/2-1982-599965
Though transitions in the Azores officially remained at 0:00s through 1992,
this was equivalent to the EU-style 1:00u adopted by the mainland in 1986, so
model it as such.
Rearguard section, for parsers lacking %z; see ziguard.awk.
-2:00	Port	-02/-01	1942 Apr 25 22:00s
-2:00	Port	+00	1942 Aug 15 22:00s
-2:00	Port	-02/-01	1943 Apr 17 22:00s
-2:00	Port	+00	1943 Aug 28 22:00s
-2:00	Port	-02/-01	1944 Apr 22 22:00s
-2:00	Port	+00	1944 Aug 26 22:00s
-2:00	Port	-02/-01	1945 Apr 21 22:00s
-2:00	Port	+00	1945 Aug 25 22:00s
-2:00	Port	-02/-01	1966 Oct  2  2:00s
-1:00	-	-01	1982 Mar 28  0:00s
-1:00	Port	-01/+00	1986
End of rearguard section.

From Paul Eggert (1996-11-12):
IATA SSIM (1991/1992) reports that the Azores were at -1:00.
IATA SSIM (1993-02) says +0:00; later issues (through 1996-09) say -1:00.

From Tim Parenti (2024-07-01):
After mainland Portugal had shifted forward an hour from 1992-09-27, Decreto
Legislativo Regional 29/92/A of 1992-12-23 sought to "reduce the time
difference" by shifting the Azores forward as well from 1992-12-27.  Just six
months later, this was revoked by Decreto Legislativo Regional 9/93/A, citing
"major changes in work habits and way of life."  Though the revocation didn't
give a transition time, it was signed Wednesday 1993-06-16; assume it took
effect later that evening, and that an EU-style spring forward (to +01) was
still observed in the interim on 1993-03-28.
https://dre.pt/dr/detalhe/decreto-legislativo-regional/29-1992-621553
https://dre.pt/dr/detalhe/decreto-legislativo-regional/9-1993-389633

Attributed Statements:

Tim Parenti (2024-07-01):

While Decreto-Lei 309/76 of 1976-04-27 reintroduced DST on the mainland by falling back on 1976-09-26, it assigned the Permanent Time Commission to study and propose revisions for the Azores and Madeira. Decreto Regional 9/77/A of 1977-05-17 affirmed that "the legal time remained unchanged in the Azores" at UT-1, and would remain there year-round. https://dre.pt/dr/detalhe/decreto-regional/9-1977-252066 Decreto Regional 2/82/A, published 1982-03-02, adopted DST in the same fashion as the mainland used at the time. https://dre.pt/dr/detalhe/decreto-regional/2-1982-599965 Though transitions in the Azores officially remained at 0:00s through 1992, this was equivalent to the EU-style 1:00u adopted by the mainland in 1986, so model it as such. Rearguard section, for parsers lacking %z; see ziguard.awk. -2:00 Port -02/-01 1942 Apr 25 22:00s -2:00 Port +00 1942 Aug 15 22:00s -2:00 Port -02/-01 1943 Apr 17 22:00s -2:00 Port +00 1943 Aug 28 22:00s -2:00 Port -02/-01 1944 Apr 22 22:00s -2:00 Port +00 1944 Aug 26 22:00s -2:00 Port -02/-01 1945 Apr 21 22:00s -2:00 Port +00 1945 Aug 25 22:00s -2:00 Port -02/-01 1966 Oct 2 2:00s -1:00 - -01 1982 Mar 28 0:00s -1:00 Port -01/+00 1986 End of rearguard section.

Paul Eggert (1996-11-12):

IATA SSIM (1991/1992) reports that the Azores were at -1:00. IATA SSIM (1993-02) says +0:00; later issues (through 1996-09) say -1:00.

Tim Parenti (2024-07-01):

After mainland Portugal had shifted forward an hour from 1992-09-27, Decreto Legislativo Regional 29/92/A of 1992-12-23 sought to "reduce the time difference" by shifting the Azores forward as well from 1992-12-27. Just six months later, this was revoked by Decreto Legislativo Regional 9/93/A, citing "major changes in work habits and way of life." Though the revocation didn't give a transition time, it was signed Wednesday 1993-06-16; assume it took effect later that evening, and that an EU-style spring forward (to +01) was still observed in the interim on 1993-03-28. https://dre.pt/dr/detalhe/decreto-legislativo-regional/29-1992-621553 https://dre.pt/dr/detalhe/decreto-legislativo-regional/9-1993-389633

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.