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

[Alexander Belopolsky]

It looks like the decree № 59 was not implemented and replaced by decree №
147 <http://istmat.info/node/35854> which postponed the implementation
until July 1, 1919.   This is close to the date in tzdata, but it would
still make more sense to have transition on a round UTC hour rather than at
21:28:41.

On Tue, Aug 23, 2016 at 11:57 PM, Alexander Belopolsky <
alexander.belopolsky at gmail.com> wrote:

>
> 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 not.
>
> 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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