Arthur David Olson <olsona@elsie.nci.nih.gov> writes:

Here's my lastest try at avoiding problems with zones such as CST5CDT;

The patch to 'backward' looks fine, but the patch to 'northamerica' has some problems. First, it removes support for TZ='EST', TZ='MST', TZ='HST', which have been in the tz database since 1987. Second, it creates new Zones AST4ADT, YST9YDT, HST10HDT that are not needed for backwards compatibility, as they have never been supported by the tz data. Third, it creates new Zones AST4, EST5, CST6, MST7, PST8, YST9, HST10 that also are not needed for backward compatibility (for the same reason as above), and furthermore don't change how TZ strings are evaluated (as they are equivalent to their POSIX interpretations). Here's a proposed patch to 'northamerica' to address these issues. --- northamerica 2005/11/28 15:52:28 2005.15 +++ northamerica 2005/12/19 21:52:52 2005.15.1.2 @@ -131,6 +131,24 @@ Rule US 1987 2006 - Apr Sun>=1 2:00 1:00 Rule US 2007 max - Mar Sun>=8 2:00 1:00 D Rule US 2007 max - Nov Sun>=1 2:00 0 S +# From Arthur David Olson, 2005-12-19 +# We generate the files specified below to guard against old files with +# obsolete information being left in the time zone binary directory. +# We do these as separate Zones rather than as Links to avoid problems if +# a particular place changes whether it observes DST. +# We put these specifications here in the northamerica file both to +# increase the chances that they'll actually get compiled and to +# avoid the need to duplicate the US rules in another file. + +# Zone NAME GMTOFF RULES FORMAT [UNTIL] +Zone EST -5:00 - EST +Zone MST -7:00 - MST +Zone HST -10:00 - HST +Zone EST5EDT -5:00 US E%sT +Zone CST6CDT -6:00 US C%sT +Zone MST7MDT -7:00 US M%sT +Zone PST8PDT -8:00 US P%sT + # From Bob Devine (1988-01-28): # ...Alaska (and Hawaii) had the timezone names changed in 1967. # old new