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October 21, 2020 11:13
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# Source: https://www.iana.org/time-zones/repository/releases/tzdata2020c.tar.gz | |
# | |
# Michigan | |
# | |
# From Bob Devine (1988-01-28): | |
# Michigan didn't observe DST from 1968 to 1973. | |
# | |
# From Paul Eggert (1999-03-31): | |
# Shanks writes that Michigan started using standard time on 1885-09-18, | |
# but Howse writes (pp 124-125, referring to Popular Astronomy, 1901-01) | |
# that Detroit kept | |
# | |
# local time until 1900 when the City Council decreed that clocks should | |
# be put back twenty-eight minutes to Central Standard Time. Half the | |
# city obeyed, half refused. After considerable debate, the decision | |
# was rescinded and the city reverted to Sun time. A derisive offer to | |
# erect a sundial in front of the city hall was referred to the | |
# Committee on Sewers. Then, in 1905, Central time was adopted | |
# by city vote. | |
# | |
# This story is too entertaining to be false, so go with Howse over Shanks. | |
# | |
# From Paul Eggert (2001-03-06): | |
# Garland (1927) writes "Cleveland and Detroit advanced their clocks | |
# one hour in 1914." This change is not in Shanks. We have no more | |
# info, so omit this for now. | |
# | |
# From Paul Eggert (2019-07-06): | |
# Due to a complicated set of legal maneuvers, in 1967 Michigan did | |
# not start daylight saving time when the rest of the US did. | |
# Instead, it began DST on Jun 14 at 00:01. This was big news: | |
# the Detroit Free Press reported it at the top of Page 1 on | |
# 1967-06-14, in an article "State Adjusting to Switch to Fast Time" | |
# by Gary Blonston, above an article about Thurgood Marshall's | |
# confirmation to the US Supreme Court. Although Shanks says Detroit | |
# observed DST until 1967-10-29 00:01, that time of day seems to be | |
# incorrect, as the Free Press later said DST ended in Michigan at the | |
# same time as the rest of the US. Also, although Shanks reports no DST in | |
# Detroit in 1968, it did observe DST that year; in the November 1968 | |
# election Michigan voters narrowly repealed DST, effective 1969. | |
# | |
# Most of Michigan observed DST from 1973 on, but was a bit late in 1975. | |
# Rule NAME FROM TO - IN ON AT SAVE LETTER | |
Rule Detroit 1948 only - Apr lastSun 2:00 1:00 D | |
Rule Detroit 1948 only - Sep lastSun 2:00 0 S | |
# Zone NAME STDOFF RULES FORMAT [UNTIL] | |
Zone America/Detroit -5:32:11 - LMT 1905 | |
-6:00 - CST 1915 May 15 2:00 | |
-5:00 - EST 1942 | |
-5:00 US E%sT 1946 | |
-5:00 Detroit E%sT 1967 Jun 14 0:01 | |
-5:00 US E%sT 1969 | |
-5:00 - EST 1973 | |
-5:00 US E%sT 1975 | |
-5:00 - EST 1975 Apr 27 2:00 | |
-5:00 US E%sT |
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