29 Oct
2018
29 Oct
'18
4:34 p.m.
On Oct 29, 2018, at 10:19 AM, Clem Cole <clemc(a)ccc.com> wrote:
I >>think<< it is more likely 06:30 UTC,
as IIRC Daylight Saving Time finished mid-month so I think it would have been UTC+8:00
[not +7:00 which it would be now]. That said, Nixon [...shutter...] was in office and he
put the US went on DST in the winter at some point due to the oil crisis (but I thought
that was a year or so later). I remember it all happening at the time - but I can do not
put precise dates on any of it.
According to tzdata...
% zdump -v America/Los_Angeles | grep 1969
America/Los_Angeles Sun Apr 27 09:59:59 1969 UTC = Sun Apr 27 01:59:59 1969 PST isdst=0
America/Los_Angeles Sun Apr 27 10:00:00 1969 UTC = Sun Apr 27 03:00:00 1969 PDT isdst=1
America/Los_Angeles Sun Oct 26 08:59:59 1969 UTC = Sun Oct 26 01:59:59 1969 PDT isdst=1
America/Los_Angeles Sun Oct 26 09:00:00 1969 UTC = Sun Oct 26 01:00:00 1969 PST isdst=0
...it appears that DST was *not* in effect on October 30, 1969.
A caveat: tzdata’s docs warn that dates before 1970 may not be accurate. But because I’m
fascinated by the cultural history embedded within that database, I downloaded the latest
tzdata files to check. The relevant rules are in the ‘northamerica’ file:
Rule CA 1948 only - Mar 14 2:01 1:00 D
Rule CA 1949 only - Jan 1 2:00 0 S
Rule CA 1950 1966 - Apr lastSun 1:00 1:00 D
Rule CA 1950 1961 - Sep lastSun 2:00 0 S
Rule CA 1962 1966 - Oct lastSun 2:00 0 S
Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02
-8:00 US P%sT 1946
-8:00 CA P%sT 1967
-8:00 US P%sT
I wouldn’t say that’s definitive, but usually tzdata is a pretty good source.
Best,
—John