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Most (all?) of Russia has moved to what's effectively year-round daylight savings time, so that the "standard" zone names now mean an hour later than they used to. Update that, notably changing MSK as per recent complaint from Sergey Konoplev, but also CHOT, GET, IRKT, KGT, KRAT, MAGT, NOVT, OMST, VLAT, YAKT, YEKT. The corresponding DST abbreviations are presumably now obsolete, but I left them in place with their old definitions, just to reduce any possible breakage from this change. Also add VOLT (Europe/Volgograd), which for some reason we never had before, as well as MIST (Antarctica/Macquarie), and fix obsolete definitions of MAWT, TKT, and WST.
src/timezone/tznames/README tznames ======= This directory contains files with timezone sets for PostgreSQL. The problem is that time zone abbreviations are not unique throughout the world and you might find out that a time zone abbreviation in the `Default' set collides with the one you wanted to use. All other files except for `Default' are intended to override values from the `Default' set. So you might already have a file here that serves your needs. If not, you can create your own. In order to use one of these files, you need to set timezone_abbreviations = 'xyz' in any of the usual ways for setting a parameter, where xyz is the filename that contains the desired time zone names. If you do not find an appropriate set of time zone names for your geographic location supplied here, please report this to <pgsql-hackers@postgresql.org>. Your set of time zone names can then be included in future releases. For the time being you can always add your own set. The files named Africa.txt, etc, are not intended to be used directly as time zone abbreviation files. They contain reference definitions of time zone names that can be copied into a custom abbreviation file as needed. Note that these files (*.txt) are already a subset of the zic timezone database files: we tried to list only those time zones that (according to the zic timezone database) appear to be still in use.