TZ maintains for zone America/Tijuana that there was not DST observed between 1961 and 1975.
# Baja California Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 7:00u -7:00 - MST 1924 -8:00 - PST 1927 Jun 10 -7:00 - MST 1930 Nov 15 -8:00 - PST 1931 Apr 1 -8:00 1:00 PDT 1931 Sep 30 -8:00 - PST 1942 Apr 24 -8:00 1:00 PWT 1945 Aug 14 23:00u -8:00 1:00 PPT 1945 Nov 15 # Peace -8:00 - PST 1948 Apr 5 -8:00 1:00 PDT 1949 Jan 14 -8:00 - PST 1950 May 1 -8:00 1:00 PDT 1950 Sep 24 -8:00 - PST 1951 Apr 29 2:00 -8:00 1:00 PDT 1951 Sep 30 2:00 -8:00 - PST 1952 Apr 27 2:00 -8:00 1:00 PDT 1952 Sep 28 2:00 -8:00 - PST 1954 -8:00 CA P%sT 1961 -8:00 - PST 1976 -8:00 US P%sT 1996 -8:00 Mexico P%sT 2001 -8:00 US P%sT 2002 Feb 20 -8:00 Mexico P%sT 2010 -8:00 US P%sT
A user of our astrology service, born in 1973 in he border town Mexicali claimed that they observed DST in his town, just like on the other side of the border in California, when he was born on 30 May 1973. I did a quick newspaper archive research on https://hndm.iib.unam.mx/ and found that Título: Periódico Oficial del Estado de Baja California Norte Fecha: 1973-04-20 states clearly that DST was observed from last Sunday in April to last Sunday in October. This means the the TZ table above is false, at least for 1973. I assume that the same is the case for several other years. I attach the screenshot for 1973 The page https://hndm.iib.unam.mx/consulta/publicacion/visualizar/558075be7d1e63c9fea... should allow to search for other years as well. I used the keywords *hora legal* for my search, though do not see that now in the URL.
