[tz] [PROPOSED PATCH 2/4] Phase out invented abbrs for Antarctica

Alexander Belopolsky alexander.belopolsky at gmail.com
Wed Aug 24 03:57:17 UTC 2016

On Tue, Aug 23, 2016 at 9:25 PM, Paul Eggert <eggert at cs.ucla.edu> wrote:
>> What's the difference between MSM (Midsummer) and MDST (Moscow Double
>> Summer Time)?  Both seem to be +05 = MSK + 2, but got different
>> abbreviations.
> The former differs from UT by an integer number of hours, the latter does

Interesting.  It looks like the transition to integer offset from UTC is
recorded as happening on Mon Jun 30 21:28:41 1919 UT (from zdump -v
output.)  However, according to this February 18, 1919 decree № 59 <
http://istmat.info/node/35567>, the GMT-based system of 11 zones (belts)
went into effect on GMT midnight, April 1, 1919.  The decree does not
mention Moscow time, but the UTC+2 belt boundaries are defined by the state
boundaries on the West and rivers Volga and Don on the east which places
Moscow in UTC+2.   The decree does not establish DST rules, but allows
regional DST shifts by integer number of hours only.
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