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* europe, zic.8: Correct Bern Mean Time to 0:29:46.

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Reported by Alois Treindl in
<http://mm.icann.org/pipermail/tz/2013-September/020139.html>.
This commit is contained in:
Paul Eggert
2013-09-11 09:17:03 -07:00
parent a46793a95b
commit 09f994d25d
2 changed files with 23 additions and 16 deletions
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europe
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@ -2650,32 +2650,36 @@ Zone Europe/Stockholm 1:12:12 - LMT 1879 Jan 1
# The 1940 rules must be deleted.
#
# One further detail for Switzerland, which is probably out of scope for
# most users of tzdata:
# The zone file
# Zone Europe/Zurich 0:34:08 - LMT 1848 Sep 12
# 0:29:44 - BMT 1894 Jun #Bern Mean Time
# 1:00 Swiss CE%sT 1981
# 1:00 EU CE%sT
# most users of tzdata: The [Europe/Zurich zone] ...
# describes all of Switzerland correctly, with the exception of
# the Cantone Geneve (Geneva, Genf). Between 1848 and 1894 Geneve did not
# follow Bern Mean Time but kept its own local mean time.
# To represent this, an extra zone would be needed.
#
# From Alois Treindl (2013-09-11):
# The Federal regulations say
# http://www.admin.ch/opc/de/classified-compilation/20071096/index.html
# ... the meridian for Bern mean time ... is 7 degrees 26'22.50".
# Expressed in time, it is 0h29m45.5s.
# From Paul Eggert (2013-09-09):
# From Paul Eggert (2013-09-11):
# Round to the nearest even second, 0:29:46.
#
# We can find no reliable source for Shanks's claim that all of Switzerland
# except Geneva switched to Bern Mean Time at 00:00 on 1848-09-12. On the
# contrary, a more-reliable source talks about "the gradual introduction of a
# national time (from the 1850s)" (Google translation) with a switch to CET in
# 1894; see Speich's review of Messerli's thesis, Traverse 1997/3, 131-3
# <http://www.tg.ethz.ch/dokumente/pdf_files/rez_messerli.pdf>. For now, model
# this messy process as a transition in 1855. The "0:29:44" is also suspect.
# this messy process as a transition in 1855. Shanks's 1894 transition is more
# plausible for Zurich but has not been checked.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Swiss 1941 1942 - May Mon>=1 1:00 1:00 S
Rule Swiss 1941 1942 - Oct Mon>=1 2:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Europe/Zurich 0:34:08 - LMT 1855 # See above comment.
0:29:44 - BMT 1894 Jun # Bern Mean Time
0:29:46 - BMT 1894 Jun # Bern Mean Time
1:00 Swiss CE%sT 1981
1:00 EU CE%sT