[tz] [PROPOSED PATCH] Fix 1948-1966 transitions for Los Angeles
davidc at astrosoftware.com
Sat Aug 20 13:02:56 UTC 2016
It does appear that DST ended in California on 16 Jan instead of 1 Jan 1949.
A newspaper arnnouncement of DST ending on 16 Jan 1949 would confirm this.
At http://libguides.csuchico.edu/c.php?g=414160&p=2822074 there is a link to
a Los Angeles Times Archive 1881 - 1990. Clicking on the link indicates that
one must be a University of California at Chico student, faculty, or staff
to access it. I might be able to find an astrologer in Chico who can help do
this (astrologers are motivated to determine observance of DST for old
dates) if nobody else on this list has a way to confirm this date.
----- Original Message -----
From: "Paul Eggert" <eggert at cs.ucla.edu>
To: <tz at iana.org>
Sent: Friday, August 19, 2016 10:25 PM
Subject: [tz] [PROPOSED PATCH] Fix 1948-1966 transitions for Los Angeles
> These changes came from research I did to check the historical
> background behind Assembly Bill 385, which would abolish daylight
> saving time in California, and which has passed the CA Senate
> Appropriations Committee's suspense file. See: White JB. Bill
> letting California end Daylight Saving Time clears key
> committee. Sacramento Bee 2016-08-11.
> * NEWS, northamerica (CA): For America/Los_Angeles, correct
> spring-forward transition times from 02:00 to 02:01 in 1948, from
> 02:00 to 01:00 in 1950-1966. Correct the fall-back transition
> date for early 1949 from 1949-01-01 to 1949-01-16.
> NEWS | 7 +++++++
> northamerica | 35 ++++++++++++++++++++++++++++++++---
> 2 files changed, 39 insertions(+), 3 deletions(-)
> diff --git a/NEWS b/NEWS
> index ba26a49..a8479eb 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -7,6 +7,13 @@ Unreleased, experimental changes
> New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
> (Thanks to Tim Parenti.)
> + Changes affecting past time stamps
> + For America/Los_Angeles, spring-forward transition times have been
> + corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
> + 1950-1966. The fall-back transition date for early 1949 has been
> + corrected from 1949-01-01 to 1949-01-16.
> Changes affecting code
> zic no longer generates binary files containing POSIX TZ-like
> diff --git a/northamerica b/northamerica
> index 6256f97..c9c2061 100644
> --- a/northamerica
> +++ b/northamerica
> @@ -413,11 +413,40 @@ Zone America/Denver -6:59:56 - LMT 1883 Nov 18
> # north of the Salmon River, and the towns of Burgdorf and Warren),
> # Nevada (except West Wendover), Oregon (except the northern 3/4 of
> # Malheur county), and Washington
> +# From Paul Eggert (2016-08-19):
> +# In 1948 California had an electricity shortage. To save electricity,
> +# in early February PG&E changed power frequency from 60 to 59.5 Hz
> +# daylight hours, causing electric clocks to lose six minutes per day.
> +# (This did not change legal time, and is not part of the data here.)
> +# See: Ross SA. An energy crisis from the past: Northern California in
> +# Working Paper No. 8, Institute of Governmental Studies, UC Berkeley,
> +# http://escholarship.org/uc/item/8x22k30c
> +# In another measure to save electricity, DST was instituted from
> +# at 02:01 to 1949-01-16 at 02:00, with the governor having the option to
> +# the fallback transition earlier. See pages 3-4 of:
> +# Apparently the governor did not exercise the option.
> +# In response:
> +# Governor Warren received a torrent of objecting mail, and it is not
> too much
> +# to speculate that the objections to Daylight Saving Time were one
> +# factor in the defeat of the Dewey-Warren Presidential ticket in
> +# -- Ross, p 25
> +# Despite the controversy, in 1949 California voters approved Proposition
> +# which established DST from April's last Sunday at 01:00 until
> +# last Sunday at 02:00. This was amended by 1962's Proposition 6, which
> +# the fall-back date to October's last Sunday. See:
> # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER
> -Rule CA 1948 only - Mar 14 2:00 1:00 D
> -Rule CA 1949 only - Jan 1 2:00 0 S
> -Rule CA 1950 1966 - Apr lastSun 2:00 1:00 D
> +Rule CA 1948 only - Mar 14 2:01 1:00 D
> +Rule CA 1949 only - Jan 16 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 NAME GMTOFF RULES FORMAT [UNTIL]
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