# the following is based on the list [http://oal.ul.pt/documentos/2018/01/hl1911a2018.pdf] # with the kind help of Suzana Ferreira of the Observatório Astronómico de Lisboa (OAL) # 1916 # [https://dre.pt/application/file/267096.pdf] Decreto n.º 2433 - Diário do Govêrno n.º 115/1916, Série I de 1916-06-09 # legal time switches from 1916-06-17T23 to 1916-06-18T00, applies to "continente da República", not to Madeira, Azores # [https://dre.pt/application/file/590867.pdf] Decreto n.º 2712 - Diário do Govêrno n.º 218/1916, 1º Suplemento, Série I de 1916-10-28 # legal time switches back from 1916-11-01T01 to 1916-11-01T00 # 1917..1922 # [https://dre.pt/application/file/261799.pdf] Decreto n.º 2922 Art 7.° - Diário do Govêrno n.º 257/1916, Série I de 1916-12-30 # legal time switches to UT + 01 h on March 01 and back to UT on Oct 31 -- no time of day is indicated # The decree is about economy during the war -- the time steps are meant to save energy # [https://dre.pt/application/file/495199.pdf] Decreto n.º 3446 - Diário do Govêrno n.º 175/1917, Série I de 1917-10-11 # alters previous decree n.º 2922: legal time switches back on Oct 14 from 24:00 to 23:00 # this applies for 1917 "nas ilhas adjacentes" [Madeira, Azores] only two days after the published decree has arrived at these islands # 1922..1924 # [https://dre.tretas.org/dre/2417587.dre.pdf] Decreto 8038, Diário do Govêrno n.º 36/1922 Série I de 18 de Fevereiro # revokes previous 2 decrees n.º 2922, n.º 3446 # 1924 # [https://dre.pt/application/file/652036.pdf] Decreto n.º 9592 - Diário do Govêrno n.º 82/1924, Série I de 1924-04-14 # legal time switches from 1924-04-16T23 to 1924-04-17T00 and from 1924-10-05T00 to 1924-10-04T23 # the decree gives railway, telegraphy connections with France and Spain as reasons -- in fact, the switches agree with France until 1940-02-25 # 1926 # [https://dre.pt/application/file/207683.pdf] Decreto n.º 11574 - Diário do Govêrno n.º 79/1926, Série I de 1926-04-14 # legal time switches from 1926-04-17T23 to 1926-04-18T00 and [incorrectly] from 1926-10-05T00 to 1926-10-04T23 # [https://dre.pt/application/file/159066.pdf] Decreto n.º 12411 - Diário do Govêrno n.º 219/1926, Série I de 1926-10-01 # legal time switches from 1926-10-03T00 to 1926-10-02T23 -- corrected to a Sunday # the decree notes that Spain has the same step (even though tzdb does not, which is an error) # 1927 # [https://dre.pt/application/file/645643.pdf] Decreto n.º 13384 - Diário do Govêrno n.º 67/1927, Série I de 1927-04-01 # legal time switches from 1927-04-09T23 to 1927-04-10T00, back in October # mentions Britain, France, Spain with the same step # [https://dre.pt/application/file/677293.pdf] Decreto n.º 14312 - Diário do Govêrno n.º 211/1927, Série I de 1927-09-23 # legal time switches from 1927-10-02T00 to 1927-10-01T23, notes the same step in Britain, France, Spain # 1928 # [https://dre.pt/application/file/645643.pdf] Decreto n.º 15321 - Diário do Govêrno n.º 79/1928, Série I de 1928-04-05 # legal time switches from 1928-04-14T23 to 1928-04-15T00, back in October # [https://dre.pt/application/file/607442.pdf] Decreto n.º 15984 - Diário do Govêrno n.º 224/1928, Série I de 1928-09-28 # legal time switches from 1928-10-07T00 to 1928-10-06T23 # 1929 # [https://dre.pt/application/file/355847.pdf] Decreto n.º 16704 - Diário do Govêrno n.º 80/1929, Série I de 1929-04-10 # legal time switches from 1929-04-20T23 to 1929-04-21T00 # One part of the decree incorrectly specifes the jump from from 1929-04-21T23 to 1928-04-22T00. # [https://dre.pt/application/file/291174.pdf] Decreto n.º 17403 - Diário do Govêrno n.º 225/1929, Série I de 1929-10-01 # legal time switches from 1929-10-06T00 to 1929-10-05T23 # 1931 # [https://dre.pt/application/file/212357.pdf] Decreto n.º 19522 - Diário do Govêrno n.º 73/1931, Série I de 1931-03-28 # legal time switches from 1931-04-18T23 to 1931-04-19T00 # [https://dre.pt/application/file/501959.pdf] Decreto n.º 20335 - Diário do Govêrno n.º 219/1931, Série I de 1931-09-22 # legal time switches from 1931-10-04T00 to 1931-10-03T23 # 1932 # [https://dre.pt/application/file/523105.pdf] Decreto n.º 20963 - Diário do Govêrno n.º 54/1932, Série I de 1932-03-04 # legal time switches from 1932-04-02T23 to 1932-04-03T00 and from 1932-10-02T00 to 1932-10-01T23 # [https://dre.pt/application/file/524308.pdf] Decreto n.º 21098 - Diário do Govêrno n.º 89/1932, Série I de 1932-04-15 # the decree n.º 20963 applies only to the continent [not to Madeira, Azores] # 1934 # [https://dre.pt/application/file/672895.pdf] Decreto-Lei n.º 23722 - Diário do Govêrno n.º 73/1934, Série I de 1934-03-29 # legal time on the continent switches from 1934-04-07T23 to 1934-04-08T00 and from 1934-10-07T00 to 1932-10-06T23 # 1935 # [https://dre.pt/application/file/379437.pdf] Decreto n.º 25144 - Diário do Govêrno n.º 63/1935, Série I de 1935-03-19 # legal time on the continent switches from 1935-03-30T23 to 1935-03-31T00 and from 1935-10-06T00 to 1935-10-05T23 # the first decree using the term "hora normal" (normal time) for legal time while not advanced. # 1936 # [https://dre.pt/application/file/690895.pdf] Decreto-Lei n.º 26460 - Diário do Govêrno n.º 71/1936, Série I de 1936-03-26 # legal time on the continent switches from 1936-04-18T23 to 1935-04-19T00 # [https://dre.pt/application/file/322214.pdf] Decreto-Lei n.º 27034 - Diário do Govêrno n.º 226/1936, Série I de 1936-09-25 # legal time on the continent switches from 1936-10-04T00 to 1936-10-03T23 # 1937 # [https://dre.pt/application/file/418561.pdf] Decreto-Lei n.º 27591 - Diário do Govêrno n.º 65/1937, Série I de 1937-03-19 # legal time on the continent switches from 1937-04-03T23 to 1937-04-04T00 and from 1937-10-03T00 to 1937-10-02T23 # 1938 # [https://dre.pt/application/file/230201.pdf] Decreto-Lei n.º 28534 - Diário do Govêrno n.º 64/1938, Série I de 1938-03-19 # legal time on the continent switches from 1938-03-26T23 to 1938-03-27T00 # [https://dre.pt/application/file/351409.pdf] # legal time on the continent switches from 1938-10-02T00 to 1938-10-01T23 # 1939 # [https://dre.pt/application/file/424614.pdf] Portaria n.º 9187 - Diário do Govêrno n.º 72/1939, Série I de 1939-03-28 # legal time switches from 1939-04-15T23 to 1939-04-16T00 and from 1939-10-08T00 --> 1939-10-07T23 # [https://dre.pt/application/file/186980.pdf] Portaria n.º 9334 - Diário do Govêrno n.º 235/1939, Série I de 1939-10-07 # delays the return of legal time to normal time to the switch from 1939-11-19T00 to 1939-11-18T23 # 1940 # [https://dre.pt/application/file/189055.pdf] Portaria n.º 9465 - Diário do Govêrno n.º 39/1940, Série I de 1940-02-17 # legal time switches from 1940-02-24T23 to 1940-02-25T00 # [https://dre.pt/application/file/189055] Portaria n.º 9658 - Diário do Govêrno n.º 233/1940, Série I de 1940-10-07[sic] # legal time switches from 1940-10-08T00 to 1940-10-07T23 # 1941 # [https://dre.pt/application/file/416897] Portaria n.º 9764 - Diário do Govêrno n.º 70/1941, Série I de 1941-03-26 # legal time switches from 1941-04-05T23 to 1941-04-06T00 # [https://dre.pt/application/file/370763] Portaria n.º 9900 - Diário do Govêrno n.º 225/1941, Série I de 1941-09-26 # legal time switches from 1941-10-08T00 to 1941-10-07T23 # 1942 # [https://dre.pt/application/file/168477.pdf] Portaria n.° 10:034 of 1942-03-02 # legal time switches from 1942-03-14T23 to 1942-03-15T00 and from 1942-04-25T23 to 1942-04-26T00 # and from 1942-08-16T00 to 1942-08-15T23 and from 1942-10-25T00 to 1942-10-24T23 # the first decree using the term "hora de verão" (summer time) for legal time while advanced. # 1943 # [https://dre.pt/application/file/594255] Portaria n.º 10348 - Diário do Govêrno n.º 45/1943, Série I de 1943-02-26 # legal time switches from 1943-03-13T23 to 1943-03-14T00 and from 1943-04-17T23 to 1943-04-18T00 # and from 1943-08-29T00 to 1943-08-28T23 and from 1943-10-31T00 to 1943-10-30T23 # 1944 # [https://dre.pt/application/file/272685.pdf] Portaria n.º 10612 - Diário do Govêrno n.º 46/1944, Série I de 1944-03-04 # legal time switches from 1944-03-11T23 to 1944-03-12T00 and from 1944-04-22T23 to 1944-04-23T00 # [https://dre.pt/application/file/551545.pdf] Portaria n.º 10727 - Diário do Govêrno n.º 182/1944, Série I de 1944-08-18 # legal time switches from 1944-08-27T00 to 1944-08-26T23 # [https://dre.pt/application/file/561947.pdf] Portaria n.º 10760 - Diário do Govêrno n.º 229/1944, Série I de 1944-10-18 # legal time switches from 1944-10-29T00 --> 1944-10-28T23 # 1945 # [https://dre.pt/application/file/624750.pdf] Portaria n.º 10889 - Diário do Govêrno n.º 47/1945, Série I de 1945-03-05 # legal time switches from 1945-03-10T23 to 1945-03-11T00 and from 1945-04-21T23 to 1945-04-22T00 # [https://dre.pt/application/file/521356.pdf] Portaria n.º 11059 - Diário do Govêrno n.º 178/1945, Série I de 1945-08-10 # legal time switches from 1945-08-26T00 to 1945-08-25T23 and from 1945-10-28T00 to 1945-10-27T23 # 1946 # [https://dre.pt/application/file/338912.pdf] Portaria n.º 11299 - Diário do Governo n.º 61/1946, Série I de 1946-03-22 # legal time switches from 1946-04-06T23 to 1946-04-07T00 and from 1946-10-06T00 to 1946-10-05T23 # applies to continental PT, Madeira and Azores # 1947 # [https://dre.pt/application/file/414737.pdf] Portaria n.º 11767 - Diário do Governo n.º 71/1947, Série I de 1947-03-28 # legal time switches from 1947-04-06T02 to 1947-04-06T03 and from 1947-10-05T03 to 1947-10-05T02 # applies to continental PT, Madeira and Azores # 1948 # [https://dre.pt/application/file/153017.pdf] Portaria n.º 12286 - Diário do Governo n.º 40/1948, Série I de 1948-02-19 # legal time switches from 1948-04-04T02 to 1948-04-04T03 and from 1948-10-03T03 to 1948-10-03T02 # applies to continental PT, Madeira and Azores # 1949..1966.5 # [https://dre.pt/application/file/373876.pdf] Decreto-Lei n.° 37:048 DIARIO DO GOVERNO - 1.ª SERIE, Nº 209, de 1948-09-07, Pág. 953 - 954 # legal time of the country switches on Apr 1st Sun from 02 to 03 and Oct 1st Sun from 03 to 02 # applies to continental PT, Madeira and Azores # 1966.5..1975.5 # [https://dre.pt/application/file/293829] Decreto-Lei n.º 47233 - Diário do Governo n.º 229/1966, 1º Suplemento, Série I de 1966-10-01 # legal time of the continent and the adjacent islands, stays at the offset attained in April # the first decree using the term "hora de Inverno" (winter time) for legal time while not advanced. # 1975.5..1978, 1981..1986 # [http://publicos.pt/documento/id502063/decreto-lei-309/76] Decreto-Lei 309/76 Diário do Governo, 1.ª SÉRIE, Nº 99, p 923..924, 1976-04-27 # legal time in continental Portugal is UT from Mar last Sun 00 UT (unless this is Easter # in which case it shall be the previous Sun), until Sep last Sun 00 UT # the Comissão Permanente da Hora (Standing Commission on Time) shall make a proposal for Madeira and Azores # 1978 # [http://publicos.pt/documento/id383792/portaria-112/79] Portaria n.º 113/78 de 23 de Fevereiro # legal time in continental Portugal switches from 1978-04-02T01 to 1978-04-02T02 and from 1978-10-01T02 to 1978-10-01T01 # 1979 # [http://publicos.pt/documento/id383792/portaria-112/79] Portaria 112/79, de 10 de Março # legal time in continental Portugal switches from 1979-04-01T01 to 1979-04-01T02 and from 1979-09-30T02 to 1978-09-30T01 # 1980 # [http://publicos.pt/documento/id678862/portaria-69/80] Portaria 69/80 Ministério da Educação e Ciência 1 de Março de 1980 # legal time in continental Portugal switches from 1980-04-06T01 to 1980-04-06T02 and from 1980-09-28T02 to 1980-09-28T01 # 1986..1992.5 # [http://publicos.pt/documento/id628280/decreto-lei-44-B/86] Decreto-Lei nº 44-B/86 de 7 de Março # legal time in continental Portugal switches on Mar last Sun at 01 UTC from UTC to UT + 01 h # and switches on Sep last Sun at 01 UTC from UTC + 01 h to UT # in the territory of Portugal, legal time is based on UTC # 1992.5..1996 # [https://dre.pt/application/file/291749] Decreto-Lei n.º 124/92 - Diário da República n.º 150/1992, Série I-A de 1992-07-02 # legal time in continental Portugal switches on Mar last Sun at 01 UTC from UTC + 01 h to UT + 02 h # and switches on Sep last Sun at 01 UTC from UTC + 02 h to UT + 01 h # 1996.. # [http://publicos.pt/documento/id621299/decreto-lei-17/96] Decreto-Lei n.º 17/96 - Diário da República n.º 58/1996, Série I-A de 1996-03-08 # legal time in continental Portugal switches on Mar last Sun at 01 UTC from UTC to UT + 01 h # and switches on Oct last Sun at 01 UTC from UTC + 01 h to UT # ----- Michael Deckers.