On 2018-02-16 17:58, Paul Eggert proposed:
+# ....... Assume transitions at 24:00 on the specified days until Ley No. +# 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other +# provisions which oppose" it, resulting immediately in year-round UT-03:30. +# (Since we don't know the time at which the change became law, assume clocks +# were changed at 24:00 that evening. Almanaque 2018 is a bit hand-wavey here, +# anyway.) +#....... +# https://www.impo.com.uy/diariooficial/1926/03/10/2 +#....... +Rule Uruguay 1926 only - Mar 5 24:00 0 -
The proposed date of the switch, 1926-03-06, would be before the publication of the law, which seems to be unlikely. Anyway, the Almanaque 2018 explicitly says that the switch was on 1926-04-01, the date specified by the law of 1923, and so does the Resolución of 1926-03-11 published in [http://www.impo.com.uy/diariooficial/1926/03/18/2]. I propose that tzdb follow these sources, rather than make an estimate. Michael Deckers.