Europe/Lisbon

Time zone identifier: Europe/Lisbon

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): -00:36:45 based on geographic meridian

Total recorded transitions: 225 transitions across 4 distinct offsets

Associated countries: PT

Aliases (Link targets): Portugal, WET

Historical Offset Step Chart (1880 to Present)

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

Complete Transition History (225 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1884-01-01T00:36:45Z`	`1884-01-01 00:00:00`	-00:36:45 → -00:36:45	`LMT`	No	offset-only
`1912-01-01T00:00:00Z`	`1912-01-01 00:00:00`	-00:36:45 → +00:00	`WET`	No	gap
`1916-06-17T23:00:00Z`	`1916-06-18 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1916-11-01T00:00:00Z`	`1916-11-01 00:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1917-03-01T00:00:00Z`	`1917-03-01 01:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1917-10-14T23:00:00Z`	`1917-10-14 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1918-03-01T00:00:00Z`	`1918-03-01 01:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1918-10-14T23:00:00Z`	`1918-10-14 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1919-03-01T00:00:00Z`	`1919-03-01 01:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1919-10-14T23:00:00Z`	`1919-10-14 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1920-03-01T00:00:00Z`	`1920-03-01 01:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1920-10-14T23:00:00Z`	`1920-10-14 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1921-03-01T00:00:00Z`	`1921-03-01 01:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1921-10-14T23:00:00Z`	`1921-10-14 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1924-04-16T23:00:00Z`	`1924-04-17 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1924-10-04T23:00:00Z`	`1924-10-04 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1926-04-17T23:00:00Z`	`1926-04-18 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1926-10-02T23:00:00Z`	`1926-10-02 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1927-04-09T23:00:00Z`	`1927-04-10 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1927-10-01T23:00:00Z`	`1927-10-01 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1928-04-14T23:00:00Z`	`1928-04-15 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1928-10-06T23:00:00Z`	`1928-10-06 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1929-04-20T23:00:00Z`	`1929-04-21 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1929-10-05T23:00:00Z`	`1929-10-05 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1931-04-18T23:00:00Z`	`1931-04-19 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1931-10-03T23:00:00Z`	`1931-10-03 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1932-04-02T23:00:00Z`	`1932-04-03 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1932-10-01T23:00:00Z`	`1932-10-01 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1934-04-07T23:00:00Z`	`1934-04-08 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1934-10-06T23:00:00Z`	`1934-10-06 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1935-03-30T23:00:00Z`	`1935-03-31 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1935-10-05T23:00:00Z`	`1935-10-05 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1936-04-18T23:00:00Z`	`1936-04-19 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1936-10-03T23:00:00Z`	`1936-10-03 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1937-04-03T23:00:00Z`	`1937-04-04 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1937-10-02T23:00:00Z`	`1937-10-02 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1938-03-26T23:00:00Z`	`1938-03-27 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1938-10-01T23:00:00Z`	`1938-10-01 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1939-04-15T23:00:00Z`	`1939-04-16 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1939-11-18T23:00:00Z`	`1939-11-18 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1940-02-24T23:00:00Z`	`1940-02-25 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1940-10-07T23:00:00Z`	`1940-10-07 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1941-04-05T23:00:00Z`	`1941-04-06 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1941-10-05T23:00:00Z`	`1941-10-05 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1942-03-14T23:00:00Z`	`1942-03-15 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1942-04-25T22:00:00Z`	`1942-04-26 00:00:00`	+01:00 → +02:00	`WEMT`	Yes	gap
`1942-08-15T22:00:00Z`	`1942-08-15 23:00:00`	+02:00 → +01:00	`WEST`	Yes	overlap
`1942-10-24T23:00:00Z`	`1942-10-24 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1943-03-13T23:00:00Z`	`1943-03-14 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1943-04-17T22:00:00Z`	`1943-04-18 00:00:00`	+01:00 → +02:00	`WEMT`	Yes	gap
`1943-08-28T22:00:00Z`	`1943-08-28 23:00:00`	+02:00 → +01:00	`WEST`	Yes	overlap
`1943-10-30T23:00:00Z`	`1943-10-30 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1944-03-11T23:00:00Z`	`1944-03-12 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1944-04-22T22:00:00Z`	`1944-04-23 00:00:00`	+01:00 → +02:00	`WEMT`	Yes	gap
`1944-08-26T22:00:00Z`	`1944-08-26 23:00:00`	+02:00 → +01:00	`WEST`	Yes	overlap
`1944-10-28T23:00:00Z`	`1944-10-28 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1945-03-10T23:00:00Z`	`1945-03-11 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1945-04-21T22:00:00Z`	`1945-04-22 00:00:00`	+01:00 → +02:00	`WEMT`	Yes	gap
`1945-08-25T22:00:00Z`	`1945-08-25 23:00:00`	+02:00 → +01:00	`WEST`	Yes	overlap
`1945-10-27T23:00:00Z`	`1945-10-27 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1946-04-06T23:00:00Z`	`1946-04-07 00:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1946-10-05T23:00:00Z`	`1946-10-05 23:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1947-04-06T02:00:00Z`	`1947-04-06 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1947-10-05T02:00:00Z`	`1947-10-05 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1948-04-04T02:00:00Z`	`1948-04-04 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1948-10-03T02:00:00Z`	`1948-10-03 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1949-04-03T02:00:00Z`	`1949-04-03 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1949-10-02T02:00:00Z`	`1949-10-02 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1950-04-02T02:00:00Z`	`1950-04-02 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1950-10-01T02:00:00Z`	`1950-10-01 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1951-04-01T02:00:00Z`	`1951-04-01 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1951-10-07T02:00:00Z`	`1951-10-07 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1952-04-06T02:00:00Z`	`1952-04-06 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1952-10-05T02:00:00Z`	`1952-10-05 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1953-04-05T02:00:00Z`	`1953-04-05 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1953-10-04T02:00:00Z`	`1953-10-04 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1954-04-04T02:00:00Z`	`1954-04-04 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1954-10-03T02:00:00Z`	`1954-10-03 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1955-04-03T02:00:00Z`	`1955-04-03 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1955-10-02T02:00:00Z`	`1955-10-02 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1956-04-01T02:00:00Z`	`1956-04-01 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1956-10-07T02:00:00Z`	`1956-10-07 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1957-04-07T02:00:00Z`	`1957-04-07 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1957-10-06T02:00:00Z`	`1957-10-06 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1958-04-06T02:00:00Z`	`1958-04-06 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1958-10-05T02:00:00Z`	`1958-10-05 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1959-04-05T02:00:00Z`	`1959-04-05 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1959-10-04T02:00:00Z`	`1959-10-04 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1960-04-03T02:00:00Z`	`1960-04-03 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1960-10-02T02:00:00Z`	`1960-10-02 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1961-04-02T02:00:00Z`	`1961-04-02 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1961-10-01T02:00:00Z`	`1961-10-01 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1962-04-01T02:00:00Z`	`1962-04-01 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1962-10-07T02:00:00Z`	`1962-10-07 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1963-04-07T02:00:00Z`	`1963-04-07 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1963-10-06T02:00:00Z`	`1963-10-06 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1964-04-05T02:00:00Z`	`1964-04-05 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1964-10-04T02:00:00Z`	`1964-10-04 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1965-04-04T02:00:00Z`	`1965-04-04 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1965-10-03T02:00:00Z`	`1965-10-03 02:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1966-04-03T02:00:00Z`	`1966-04-03 03:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1966-10-02T02:00:00Z`	`1966-10-02 03:00:00`	+01:00 → +01:00	`CET`	No	offset-only
`1976-09-26T00:00:00Z`	`1976-09-26 00:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1977-03-27T00:00:00Z`	`1977-03-27 01:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1977-09-25T00:00:00Z`	`1977-09-25 00:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1978-04-02T01:00:00Z`	`1978-04-02 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1978-10-01T01:00:00Z`	`1978-10-01 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1979-04-01T01:00:00Z`	`1979-04-01 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1979-09-30T01:00:00Z`	`1979-09-30 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1980-04-06T01:00:00Z`	`1980-04-06 02:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1980-09-28T01:00:00Z`	`1980-09-28 01:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1981-03-29T00:00:00Z`	`1981-03-29 01:00:00`	+00:00 → +01:00	`WEST`	Yes	gap
`1981-09-27T00:00:00Z`	`1981-09-27 00:00:00`	+01:00 → +00:00	`WET`	No	overlap
`1982-03-28T00:00:00Z`	`1982-03-28 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
`1986-03-30T01:00:00Z`	`1986-03-30 02:00:00`	+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 02:00:00`	+01:00 → +01:00	`CET`	No	offset-only
`1993-03-28T01:00:00Z`	`1993-03-28 03:00:00`	+01:00 → +02:00	`CEST`	Yes	gap
`1993-09-26T01:00:00Z`	`1993-09-26 02:00:00`	+02:00 → +01:00	`CET`	No	overlap
`1994-03-27T01:00:00Z`	`1994-03-27 03:00:00`	+01:00 → +02:00	`CEST`	Yes	gap
`1994-09-25T01:00:00Z`	`1994-09-25 02:00:00`	+02:00 → +01:00	`CET`	No	overlap
`1995-03-26T01:00:00Z`	`1995-03-26 03:00:00`	+01:00 → +02:00	`CEST`	Yes	gap
`1995-09-24T01:00:00Z`	`1995-09-24 02:00:00`	+02:00 → +01:00	`CET`	No	overlap
`1996-03-31T01:00:00Z`	`1996-03-31 02:00:00`	+01:00 → +01:00	`WEST`	Yes	offset-only
`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 2344 to 2367)

From Tim Parenti (2024-07-01):
Decreto-Lei 44-B/86 of 1986-03-07 switched mainland Portugal's transition
times from 0:00s to 1:00u to harmonize with the EEC from 1986-03-30.
https://dre.pt/dr/detalhe/decreto-lei/44-b-1986-628280
(Transitions of 1:00s as previously reported and used by the W-Eur rules,
though equivalent, appear to have been fiction here.)  Madeira continued to
use 0:00s for spring 1986 before joining with the mainland using 1:00u in the
fall; meanwhile, in the Azores the two were equivalent, so the law specifying
0:00s wasn't touched until 1992.  (See below for more on the islands.)

From Rui Pedro Salgueiro (1992-11-12):
Portugal has recently (September, 27) changed timezone
(from WET to MET or CET) to harmonize with EEC.

Martin Bruckmann (1996-02-29) reports via Peter Ilieve
that Portugal is reverting to 0:00 by not moving its clocks this spring.
The new Prime Minister was fed up with getting up in the dark in the winter.

From Paul Eggert (1996-11-12):
IATA SSIM (1991-09) reports several 1991-09 and 1992-09 transitions
at 02:00u, not 01:00u.  Assume that these are typos.

Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
STDOFF	-0:36:44.68

Attributed Statements:

Tim Parenti (2024-07-01):

Decreto-Lei 44-B/86 of 1986-03-07 switched mainland Portugal's transition times from 0:00s to 1:00u to harmonize with the EEC from 1986-03-30. https://dre.pt/dr/detalhe/decreto-lei/44-b-1986-628280 (Transitions of 1:00s as previously reported and used by the W-Eur rules, though equivalent, appear to have been fiction here.) Madeira continued to use 0:00s for spring 1986 before joining with the mainland using 1:00u in the fall; meanwhile, in the Azores the two were equivalent, so the law specifying 0:00s wasn't touched until 1992. (See below for more on the islands.)

Rui Pedro Salgueiro (1992-11-12):

Portugal has recently (September, 27) changed timezone (from WET to MET or CET) to harmonize with EEC. Martin Bruckmann (1996-02-29) reports via Peter Ilieve that Portugal is reverting to 0:00 by not moving its clocks this spring. The new Prime Minister was fed up with getting up in the dark in the winter.

Paul Eggert (1996-11-12):

IATA SSIM (1991-09) reports several 1991-09 and 1992-09 transitions at 02:00u, not 01:00u. Assume that these are typos. Zone NAME STDOFF RULES FORMAT [UNTIL] STDOFF -0:36:44.68

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.