August 2016 - tz - lists.iana.org

16th century Nuremberg time
by Steve Allen Aug. 25, 2016

Aug. 25, 2016

At the Science of Time Symposium in Cambridge Massachussetts earlier this year Kevin Birth showed a situation that tz does not have to handle. http://gallica.bnf.fr/ark:/12148/btv1b8490533n gives a view of one surviving example of the 1589 Vergleichung nachvolgender siben Uhren This was a chart to translate between the 7 different ways of counting hours (some employing unequal hours) which visitors might know from their home cities (and their pocket sundials) and the hours which were in use by various different clock towers and agencies in Nuremberg. -- Steve Allen <sla(a)ucolick.org> WGS-84 (GPS) UCO/Lick Observatory--ISB 260 Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m

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[PROPOSED PATCH 1/2] Also distribute code and data in a single tarball
by Paul Eggert Aug. 24, 2016

Aug. 24, 2016

Suggested by Arthur David Olson in: https://mm.icann.org/pipermail/tz/2000-January/010789.html * Makefile (GNUTARFLAGS): Add --sort=name, so that the single tarball is more reproducible. (clean): Remove tzdb. (tzdb-$(VERSION).tar.gz): New target. (tarballs): Add it. (tzdb-$(VERSION).tar.gz.asc): New target. (signatures): Add it. * NEWS: Document this. --- Makefile | 21 +++++++++++++++++---- NEWS | 9 +++++++++ 2 files changed, 26 insertions(+), 4 deletions(-) diff --git a/Makefile b/Makefile index fc18819..da697b7 100644 --- a/Makefile +++ b/Makefile @@ -326,7 +326,7 @@ OK_LINE= '^'$(OK_CHAR)'*$$' # Flags to give 'tar' when making a distribution. # Try to use flags appropriate for GNU tar. -GNUTARFLAGS= --numeric-owner --owner=0 --group=0 --mode=go+u,go-w +GNUTARFLAGS= --numeric-owner --owner=0 --group=0 --mode=go+u,go-w --sort=name TARFLAGS= `if tar $(GNUTARFLAGS) --version >/dev/null 2>&1; \ then echo $(GNUTARFLAGS); \ else :; \ @@ -568,7 +568,7 @@ clean_misc: rm -f core *.o *.out \ date tzselect version.h zdump zic yearistype libtz.a clean: clean_misc - rm -fr *.dir $(TZS_NEW) + rm -fr *.dir tzdb $(TZS_NEW) maintainer-clean: clean @echo 'This command is intended for maintainers to use; it' @@ -672,7 +672,8 @@ check_time_t_alternatives: done rm -fr time_t.dir -tarballs: tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz +tarballs: tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz \ + tzdb-$(VERSION).tar.gz tzcode$(VERSION).tar.gz: set-timestamps.out LC_ALL=C && export LC_ALL && \ @@ -685,7 +686,16 @@ tzdata$(VERSION).tar.gz: set-timestamps.out tar $(TARFLAGS) -cf - $(COMMON) $(DATA) $(MISC) $(TZS) | \ gzip $(GZIPFLAGS) > $@ -signatures: tzcode$(VERSION).tar.gz.asc tzdata$(VERSION).tar.gz.asc +tzdb-$(VERSION).tar.gz: set-timestamps.out + rm -fr tzdb + mkdir tzdb + ln $(COMMON) $(DOCS) $(SOURCES) $(DATA) $(MISC) $(TZS) tzdb + touch -cmr $$(ls -t tzdb/* | sed 1q) tzdb + LC_ALL=C && export LC_ALL && \ + tar $(TARFLAGS) -cf - tzdb | gzip $(GZIPFLAGS) > $@ + +signatures: tzcode$(VERSION).tar.gz.asc tzdata$(VERSION).tar.gz.asc \ + tzdb-$(VERSION).tar.gz.asc tzcode$(VERSION).tar.gz.asc: tzcode$(VERSION).tar.gz gpg --armor --detach-sign $? @@ -693,6 +703,9 @@ tzcode$(VERSION).tar.gz.asc: tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz.asc: tzdata$(VERSION).tar.gz gpg --armor --detach-sign $? +tzdb-$(VERSION).tar.gz.asc: tzdb-$(VERSION).tar.gz + gpg --armor --detach-sign $? + typecheck: $(MAKE) clean for i in "long long" unsigned; \ diff --git a/NEWS b/NEWS index 023883b..18b7c9d 100644 --- a/NEWS +++ b/NEWS @@ -32,6 +32,15 @@ Unreleased, experimental changes what should be the output of 'zdump -i -c 2050' on primary zones. 'make check' now checks that zdump generates this output. + A new distribution format is available in the tarball + tzdb-VERSION.tar.gz and the signature tzdb-VERSION.tar.gz.asc. + The new tarball has the contents of tzcodeVERSION.tar.gz and + tzdataVERSION.tar.gz, in a single top-level directory 'tzdb' with + all other files under this directory, as is typical for software + distributions. The new format is intended to replace the old + tarball pair. The old format will continue to be distributed for + a while. + Changes to documentation and commentary tzfile.5 now documents the new restriction on POSIX TZ-like -- 2.5.5

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California keeps DST (to help its crops grow?!)
by Paul Eggert Aug. 24, 2016

Aug. 24, 2016

Today the California Senate rejected Assembly Bill 385, which would have placed a measure on the state ballot asking voters whether to cancel daylight saving time. This is the bill that prompted me to fix some historical inaccuracies in tzdata's Los Angeles entry a few days ago. Sen. Jim Nelson (R-Gerber) voted against the bill, arguing that farmers benefit from DST. He said, "Our crops have gotten accustomed to that. They've in fact been bred to deal with that longer harvest season." You just can't make this stuff up.... Koseff A. Effort to roll back daylight saving time defeated in California Senate. Sacramento Bee 2016-08-23 [misdated as 2016-08-22]. http://www.sacbee.com/news/politics-government/capitol-alert/article9748310…

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[PROPOSED PATCH] Spelling fixes
by Paul Eggert Aug. 24, 2016

Aug. 24, 2016

--- NEWS | 2 +- europe | 4 ++-- factory | 4 ++-- tz-how-to.html | 2 +- 4 files changed, 6 insertions(+), 6 deletions(-) diff --git a/NEWS b/NEWS index 4c0f4e0..fd2bcbb 100644 --- a/NEWS +++ b/NEWS @@ -772,7 +772,7 @@ Release 2014h - 2014-09-25 18:59:03 -0700 zdump -c no longer mishandles transitions near year boundaries. (Thanks to Tim Parenti for reporting the problem.) - An access to uninitalized data has been fixed. + An access to uninitialized data has been fixed. (Thanks to Jörg Richter for reporting the problem.) When THREAD_SAFE is defined, the code ports to the C11 memory model. diff --git a/europe b/europe index 4219828..2ad164b 100644 --- a/europe +++ b/europe @@ -2425,7 +2425,7 @@ Zone Europe/Kaliningrad 1:22:00 - LMT 1893 Apr # attributes the 1982 changes to the Act of the Council of Ministers # of the USSR No. 126 from 18.02.1982. 1980-925.txt also adds # Udmurtia to the list of affected territories and lists Khatangsky -# district separately from Taymyr Autonomous Okurg. Probably erroneously. +# district separately from Taymyr Autonomous Okrug. Probably erroneously. # # The affected territories are currently listed under Europe/Moscow, # Asia/Yekaterinburg and Asia/Krasnoyarsk. @@ -2756,7 +2756,7 @@ Zone Asia/Novosibirsk 5:31:40 - LMT 1919 Dec 14 6:00 # Note that time belts (numbered from 2 (Moscow) to 12 according to their # GMT/UTC offset and having too many exceptions like regions formally # belonging to one belt but using time from another) were replaced -# with time zones in 2011 with different numberings (there was a +# with time zones in 2011 with different numbering (there was a # 2-hour gap between second and third zones in 2011-2014). # From Stepan Golosunov (2016-04-12): diff --git a/factory b/factory index 7c86430..75fa4a1 100644 --- a/factory +++ b/factory @@ -3,8 +3,8 @@ # For distributors who don't want to put time zone specification in # their installation procedures. Users that run 'date' will get the -# time zone abbrevation "-00", indicating that the actual time zone is -# unknown. +# time zone abbreviation "-00", indicating that the actual time zone +# is unknown. # Zone NAME GMTOFF RULES FORMAT Zone Factory 0 - -00 diff --git a/tz-how-to.html b/tz-how-to.html index a777a4e..feb47dd 100644 --- a/tz-how-to.html +++ b/tz-how-to.html @@ -251,7 +251,7 @@ local standard time (different from wall clock time when observing daylight saving time); or it can be suffixed with ‘g’, ‘u’, or ‘z’, all three of which mean the standard time at the -<a href="https://en.wikipedia.org/wiki/Prime_Meridian">prime meridan</a>. +<a href="https://en.wikipedia.org/wiki/Prime_Meridian">prime meridian</a>. ‘g’ stands for “<a href="https://en.wikipedia.org/wiki/Greenwich_Mean_Time">GMT</a>”; ‘u’ stands for “<a -- 2.7.4

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[PROPOSED PATCH] Port 'make check_web' to Fedora
by Paul Eggert Aug. 23, 2016

Aug. 23, 2016

* Makefile (SGML_CATALOG_FILES), NEWS: Port to Fedora 23, where the catalog is in /usr/share/sgml/html/4.01/HTML4.cat. --- Makefile | 8 ++++---- NEWS | 4 ++++ 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/Makefile b/Makefile index b71211e..f6754af 100644 --- a/Makefile +++ b/Makefile @@ -272,16 +272,16 @@ AWK= awk KSHELL= /bin/bash # The path where SGML DTDs are kept and the catalog file(s) to use when -# validating. The default is appropriate for Ubuntu 13.10. +# validating. The default should work on both Debian and Red Hat. SGML_TOPDIR= /usr SGML_DTDDIR= $(SGML_TOPDIR)/share/xml/w3c-sgml-lib/schema/dtd SGML_SEARCH_PATH= $(SGML_DTDDIR)/REC-html401-19991224 SGML_CATALOG_FILES= \ - $(SGML_TOPDIR)/share/doc/w3-recs/html/www.w3.org/TR/1999/REC-html401-19991224/HTML4.cat + $(SGML_TOPDIR)/share/doc/w3-recs/html/www.w3.org/TR/1999/REC-html401-19991224/HTML4.cat:$(SGML_TOPDIR)/share/sgml/html/4.01/HTML4.cat # The name, arguments and environment of a program to validate your web pages. -# See <http://www.jclark.com/sp/> for a validator, and -# <http://validator.w3.org/source/> for a validation library. +# See <http://openjade.sourceforge.net/doc/> for a validator, and +# <https://validator.w3.org/source/> for a validation library. VALIDATE = nsgmls VALIDATE_FLAGS = -s -B -wall -wno-unused-param VALIDATE_ENV = \ diff --git a/NEWS b/NEWS index 548de8f..4c18e55 100644 --- a/NEWS +++ b/NEWS @@ -42,6 +42,8 @@ Unreleased, experimental changes (Thanks to Jon Skeet for suggesting that an option was needed, and thanks to Tim Parenti and Chris Rovick for further comments.) + Changes to build procedure + The tzdata distribution has a new file to2050.tzs that contains what should be the output of 'zdump -i -c 2050' on primary zones. 'make check' now checks that zdump generates this output. @@ -57,6 +59,8 @@ Unreleased, experimental changes significantly smaller than gzip. (Thanks to Oscar van Vlijmen for comments on the format.) + 'make check_web' now works on Fedora-like distributions. + Changes to documentation and commentary tzfile.5 now documents the new restriction on POSIX TZ-like -- 2.5.5

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Re: [tz] [PROPOSED PATCH 2/2] Use lz format for new tarball
by vanadovv＠hetnet.nl Aug. 22, 2016

Aug. 22, 2016

There are also Windows users, not only *nix users! So, please use a compression format that can be handled easily by Windows users as well. For instance, choose a format from the list that 7Zip can handle: http://www.7-zip.org/ Yes, I know, one can allways install yet again another program for one purpose only (http://lzip.nongnu.org/lzip.html) but let's try to keep things simple. Cheers! Oscar van Vlijmen >----Origineel Bericht---- >Van : eggert(a)cs.ucla.edu >Datum : 22/08/2016 05:56 >Aan : tz(a)iana.org >Onderwerp : [tz] [PROPOSED PATCH 2/2] Use lz format for new tarball > [snip] >index 18b7c9d..61213b0 100644 >--- a/NEWS >+++ b/NEWS >@@ -33,13 +33,14 @@ Unreleased, experimental changes > 'make check' now checks that zdump generates this output. > > A new distribution format is available in the tarball >- tzdb-VERSION.tar.gz and the signature tzdb-VERSION.tar.gz.asc. >+ tzdb-VERSION.tar.lz and the signature tzdb-VERSION.tar.lz.asc. > The new tarball has the contents of tzcodeVERSION.tar.gz and > tzdataVERSION.tar.gz, in a single top-level directory 'tzdb' with > all other files under this directory, as is typical for software > distributions. The new format is intended to replace the old > tarball pair. The old format will continue to be distributed for >- a while. >+ a while. The new format uses lzip compression, which is >+ significantly smaller than gzip and is simpler than xz. > > Changes to documentation and commentary > >-- >2.5.5

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The West Wing: 20 Hours in America
by Matt Johnson Aug. 22, 2016

Aug. 22, 2016

This is already mentioned in the arts file, but I just found a clip of it: https://www.youtube.com/watch?v=-J1NHzQ1sgc Cheers! -Matt

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Julia tz compiler
by Curtis Vogt Aug. 22, 2016

Aug. 22, 2016

Hello, I'm one of the main contributors to TimeZones.jl <http://github.com/JuliaTime/TimeZones.jl>: a tz compiler written in the programming language Julia <http://julialang.org/>. I would appreciate if TimeZones.jl could be added to the "Other tz compilers" section on the https://www.iana.org/time-zones/repository/tz-link.html page. The blurb could be written as: [TimeZones.jl – Time zone database access for Julia]( > https://github.com/JuliaTime/TimeZones.jl) compiles tz source into > [Julia](http://julialang.org/). It is freely available under the MIT lic > ense. Thanks for your time, Curtis Vogt

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[PROPOSED PATCH] Distribute .tzs file for regression testing
by Paul Eggert Aug. 22, 2016

Aug. 22, 2016

* NEWS: Document this. * Makefile (TZS_YEAR, TZS, TZS_NEW, TZS_DEPS): New macros. (ENCHILADA): Add TZS. ($(TZS_NEW), $(TZS), force_tzs, check_tzs): New targets. (check): Add check_tzs. (clean): Remove *.dir. (maintainer-clean): Remove $(TZS). (set-timestamps.out): Set $(TZS)'s time stamp. (check_public, check_time_t_alternatives): Use a temporary directory name ending in .dir, to make it easier to clean these directories out systematically. (tzdata$(VERSION).tar.gz): Add $(TZS). (.PHONY): Add force_tzs, check_tzs. --- Makefile | 71 ++++++++++++++++++++++++++++++++++++++++++++++------------------ NEWS | 12 +++++++---- 2 files changed, 59 insertions(+), 24 deletions(-) diff --git a/Makefile b/Makefile index bbe1ba8..fc18819 100644 --- a/Makefile +++ b/Makefile @@ -378,7 +378,12 @@ DATA= $(YDATA) $(NDATA) backzone $(TABDATA) \ leap-seconds.list yearistype.sh AWK_SCRIPTS= checklinks.awk checktab.awk leapseconds.awk MISC= $(AWK_SCRIPTS) zoneinfo2tdf.pl -ENCHILADA= $(COMMON) $(DOCS) $(SOURCES) $(DATA) $(MISC) +TZS_YEAR= 2050 +TZS= to$(TZS_YEAR).tzs +TZS_NEW= to$(TZS_YEAR)new.tzs +TZS_DEPS= $(PRIMARY_YDATA) asctime.c localtime.c \ + private.h tzfile.h zdump.c zic.c +ENCHILADA= $(COMMON) $(DOCS) $(SOURCES) $(DATA) $(MISC) $(TZS) # And for the benefit of csh users on systems that assume the user # shell should be used to handle commands in Makefiles. . . @@ -477,6 +482,27 @@ posix_packrat: zones: $(REDO) +$(TZS_NEW): $(TDATA) zdump zic + mkdir -p tzs.dir + $(zic) -d tzs.dir $(TDATA) + $(AWK) '/^Link/{print $$1 "\t" $$2 "\t" $$3}' \ + $(TDATA) | LC_ALL=C sort >$@.out + zones=$$($(AWK) -v wd="$$(pwd)" \ + '/^Zone/{print wd "/tzs.dir/" $$2}' $(TDATA) \ + | LC_ALL=C sort) && \ + ./zdump -i -c $(TZS_YEAR) $$zones >>$@.out + sed 's,^TZ=".*tzs\.dir/,TZ=",' $@.out >$@ + rm -fr tzs.dir $@.out + +# If $(TZS) does not already exist (e.g., old-format tarballs), create it. +# If it exists but 'make check_tzs' fails, a maintainer should inspect the +# failed output and fix the inconsistency, perhaps by running 'make force_tzs'. +$(TZS): + $(MAKE) force_tzs + +force_tzs: $(TZS_NEW) + cp $(TZS_NEW) $(TZS) + libtz.a: $(LIBOBJS) $(AR) ru $@ $(LIBOBJS) $(RANLIB) $@ @@ -496,7 +522,7 @@ tzselect: tzselect.ksh chmod +x $@ check: check_character_set check_white_space check_links check_sorted \ - check_tables check_web + check_tables check_tzs check_web check_character_set: $(ENCHILADA) LC_ALL=en_US.utf8 && export LC_ALL && \ @@ -532,6 +558,9 @@ check_tables: checktab.awk $(PRIMARY_YDATA) $(ZONETABLES) || exit; \ done +check_tzs: $(TZS) $(TZS_NEW) + diff -u $(TZS) $(TZS_NEW) + check_web: $(WEB_PAGES) $(VALIDATE_ENV) $(VALIDATE) $(VALIDATE_FLAGS) $(WEB_PAGES) @@ -539,12 +568,12 @@ clean_misc: rm -f core *.o *.out \ date tzselect version.h zdump zic yearistype libtz.a clean: clean_misc - rm -fr tzpublic + rm -fr *.dir $(TZS_NEW) maintainer-clean: clean @echo 'This command is intended for maintainers to use; it' @echo 'deletes files that may need special tools to rebuild.' - rm -f leapseconds $(MANTXTS) *.asc *.tar.gz + rm -f leapseconds $(MANTXTS) $(TZS) *.asc *.tar.gz names: @echo $(ENCHILADA) @@ -591,6 +620,7 @@ set-timestamps.out: $(ENCHILADA) touch -cmr `ls -t $$file workman.sh | sed 1q` $$file.txt || \ exit; \ done + touch -cmr $$(ls -t $(TZS_DEPS) | sed 1q) $(TZS) touch $@ # The zics below ensure that each data file can stand on its own. @@ -599,12 +629,12 @@ set-timestamps.out: $(ENCHILADA) check_public: $(MAKE) maintainer-clean $(MAKE) "CFLAGS=$(GCC_DEBUG_FLAGS)" ALL - mkdir tzpublic + mkdir -p public.dir for i in $(TDATA) ; do \ - $(zic) -v -d tzpublic $$i 2>&1 || exit; \ + $(zic) -v -d public.dir $$i 2>&1 || exit; \ done - $(zic) -v -d tzpublic $(TDATA) - rm -fr tzpublic + $(zic) -v -d public.dir $(TDATA) + rm -fr public.dir # Check that the code works under various alternative # implementations of time_t. @@ -616,15 +646,15 @@ check_time_t_alternatives: fi && \ zones=`$(AWK) '/^[^#]/ { print $$3 }' <zone1970.tab` && \ for type in $(TIME_T_ALTERNATIVES); do \ - mkdir -p tzpublic/$$type && \ + mkdir -p time_t.dir/$$type && \ $(MAKE) clean_misc && \ - $(MAKE) TOPDIR=`pwd`/tzpublic/$$type \ + $(MAKE) TOPDIR=$$(pwd)/time_t.dir/$$type \ CFLAGS='$(CFLAGS) -Dtime_tz='"'$$type'" \ REDO='$(REDO)' \ install && \ diff $$quiet_option -r \ - tzpublic/int64_t/etc/zoneinfo \ - tzpublic/$$type/etc/zoneinfo && \ + time_t.dir/int64_t/etc/zoneinfo \ + time_t.dir/$$type/etc/zoneinfo && \ case $$type in \ int32_t) range=-2147483648,2147483647;; \ uint32_t) range=0,4294967296;; \ @@ -633,14 +663,14 @@ check_time_t_alternatives: *) range=-10000000000,10000000000;; \ esac && \ echo checking $$type zones ... && \ - tzpublic/int64_t/etc/zdump -V -t $$range $$zones \ - >tzpublic/int64_t.out && \ - tzpublic/$$type/etc/zdump -V -t $$range $$zones \ - >tzpublic/$$type.out && \ - diff -u tzpublic/int64_t.out tzpublic/$$type.out \ + time_t.dir/int64_t/etc/zdump -V -t $$range $$zones \ + >time_t.dir/int64_t.out && \ + time_t.dir/$$type/etc/zdump -V -t $$range $$zones \ + >time_t.dir/$$type.out && \ + diff -u time_t.dir/int64_t.out time_t.dir/$$type.out \ || exit; \ done - rm -fr tzpublic + rm -fr time_t.dir tarballs: tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz @@ -652,7 +682,7 @@ tzcode$(VERSION).tar.gz: set-timestamps.out tzdata$(VERSION).tar.gz: set-timestamps.out LC_ALL=C && export LC_ALL && \ - tar $(TARFLAGS) -cf - $(COMMON) $(DATA) $(MISC) | \ + tar $(TARFLAGS) -cf - $(COMMON) $(DATA) $(MISC) $(TZS) | \ gzip $(GZIPFLAGS) > $@ signatures: tzcode$(VERSION).tar.gz.asc tzdata$(VERSION).tar.gz.asc @@ -688,7 +718,8 @@ zic.o: private.h tzfile.h version.h .PHONY: ALL INSTALL all .PHONY: check check_character_set check_links .PHONY: check_public check_sorted check_tables -.PHONY: check_time_t_alternatives check_web check_white_space clean clean_misc +.PHONY: check_time_t_alternatives check_tzs check_web check_white_space +.PHONY: clean clean_misc force_tzs .PHONY: install install_data maintainer-clean names .PHONY: posix_only posix_packrat posix_right .PHONY: public right_only right_posix signatures tarballs typecheck diff --git a/NEWS b/NEWS index 3d01581..023883b 100644 --- a/NEWS +++ b/NEWS @@ -2,18 +2,18 @@ News for the tz database Unreleased, experimental changes - Changes affecting future time stamps + Changes to future time stamps 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 + Changes to 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. - Changes affecting code + Changes to code zic no longer generates binary files containing POSIX TZ-like strings that disagree with the local time type after the last @@ -28,7 +28,11 @@ Unreleased, experimental changes (Thanks to Jon Skeet for suggesting that an option was needed, and thanks to Tim Parenti and Chris Rovick for further comments.) - Changes affecting documentation and commentary + The tzdata distribution has a new file to2050.tzs that contains + what should be the output of 'zdump -i -c 2050' on primary zones. + 'make check' now checks that zdump generates this output. + + Changes to documentation and commentary tzfile.5 now documents the new restriction on POSIX TZ-like strings that is now implemented by zic. -- 2.5.5

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[PROPOSED PATCH] Fix 1948-1966 transitions for Los Angeles
by Paul Eggert Aug. 20, 2016

Aug. 20, 2016

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. http://www.sacbee.com/news/politics-government/capitol-alert/article9511673… * 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 12:00:04 # 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 during +# 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 1948. +# Working Paper No. 8, Institute of Governmental Studies, UC Berkeley, 1973-11. +# http://escholarship.org/uc/item/8x22k30c +# +# In another measure to save electricity, DST was instituted from 1948-03-14 +# at 02:01 to 1949-01-16 at 02:00, with the governor having the option to move +# the fallback transition earlier. See pages 3-4 of: +# http://clerk.assembly.ca.gov/sites/clerk.assembly.ca.gov/files/archive/Stat… +# 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 important +# factor in the defeat of the Dewey-Warren Presidential ticket in California. +# -- Ross, p 25 +# +# Despite the controversy, in 1949 California voters approved Proposition 12, +# which established DST from April's last Sunday at 01:00 until September's +# last Sunday at 02:00. This was amended by 1962's Proposition 6, which changed +# the fall-back date to October's last Sunday. See: +# http://repository.uchastings.edu/cgi/viewcontent.cgi?article=1501&context=c… +# http://repository.uchastings.edu/cgi/viewcontent.cgi?article=1636&context=c… # # 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] -- 2.7.4

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