DST existed in Portugal 1950
TZ claims that in 1950 there was no DST in Portugal, zone Europe/Lisbon. While it was continuously applied between 1916 and 1965. The sources quoted in file europe are poor, it is only Whitman versus Shanks/Pottenger. I have research online law collection for Portugal at https://dre.pt/ and searched for 'hora de verão'. The results are sparse, but what I find on legal texts does not indicate any interruption of the 1916 law for the year 1950. This Wikipedia page shows a list https://pt.wikipedia.org/wiki/Lista_de_per%C3%ADodos_em_que_vigorou_o_hor%C3... and mentions the Decreto-Lei nº 37048 for 1949-1965. That law says 'first Sunday in April to first Sunday in October. No exception for 1950. Here is a list from the Lisbon astronomical observatory, which says the same thing. http://oal.ul.pt/documentos/2018/01/hl1911a2018.pdf/ I suggest that the rules for Europe/Lisbon should be updated accordingly.
More information about the history of legal time in Portugal is here http://oal.ul.pt/hora-legal/legislacao-sobre-a-hora-legal/ On 07.02.21 09:48, Alois Treindl wrote:
TZ claims that in 1950 there was no DST in Portugal, zone Europe/Lisbon.
While it was continuously applied between 1916 and 1965.
The sources quoted in file europe are poor, it is only Whitman versus Shanks/Pottenger.
I have research online law collection for Portugal at https://dre.pt/ and searched for 'hora de verão'. The results are sparse, but what I find on legal texts does not indicate any interruption of the 1916 law for the year 1950.
This Wikipedia page shows a list https://pt.wikipedia.org/wiki/Lista_de_per%C3%ADodos_em_que_vigorou_o_hor%C3... and mentions the Decreto-Lei nº 37048 for 1949-1965.
That law says 'first Sunday in April to first Sunday in October.
No exception for 1950.
Here is a list from the Lisbon astronomical observatory, which says the same thing.
http://oal.ul.pt/documentos/2018/01/hl1911a2018.pdf/
I suggest that the rules for Europe/Lisbon should be updated accordingly.
On 2021-02-07 08:48, Alois Treindl wrote:
TZ claims that in 1950 there was no DST in Portugal, zone Europe/Lisbon.
While it was continuously applied between 1916 and 1965.
Not in 1922, 1923, 1930, 1933.
The sources quoted in file europe are poor, it is only Whitman versus Shanks/Pottenger.
I have researched an online law collection for Portugal at https://dre.pt/ and searched for 'hora de verão'. The results are sparse, but what I find on legal texts does not indicate any interruption of the 1916 law for the year 1950.
I think I have pdfs for all switches in Lisboa (not for Madeira and the Azores). I found them several years ago, so I'd rather like to check all the URLs before I send them to the list. Please give me a day or two. Madeira is an autonomous region since about 1976 and may do their own summer time rules, and they did.
This Wikipedia page shows a list https://pt.wikipedia.org/wiki/Lista_de_per%C3%ADodos_em_que_vigorou_o_hor%C3...
and mentions the Decreto-Lei nº 370/48 for 1949-1965.
That law says 'first Sunday in April to first Sunday in October.
No exception for 1950.
Here is a list from the Lisbon astronomical observatory, which says the same thing.
This is a reliable source since the OAL is responsible for the realization of legal time in Portugal. I remember they helped me get some of the decrees.
I suggest that the rules for Europe/Lisbon should be updated accordingly.
Yes, let's try. Michael Deckers.
On 2/7/21 12:48 AM, Alois Treindl wrote:
Thanks for the pointer. I installed the attached to document the OAL and to say that Portugal observed DST in 1950. I'm looking forward to any corrections coming from the more-reliable sources that Michael Deckers mentioned, as Shanks is a thin reed.
Thank you. For astrology, such details are important. The users of my website have 28 million natal data records stored on it. 1053 of those data records fell into the summer of 1950 with birth in Portugal, and were affected by the DST error, which is now fixed. On 09.02.21 00:58, Paul Eggert wrote:
On 2/7/21 12:48 AM, Alois Treindl wrote:
Thanks for the pointer. I installed the attached to document the OAL and to say that Portugal observed DST in 1950. I'm looking forward to any corrections coming from the more-reliable sources that Michael Deckers mentioned, as Shanks is a thin reed.
# 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.
On 2021-02-10 21:31, Michael H Deckers wrongly wrote wrote:
# 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
which has to be read as # legal time in continental Portugal is UT + 01 h 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, else it is UT Michael Deckers.
participants (3)
-
Alois Treindl -
Michael H Deckers -
Paul Eggert