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

[Paul Eggert]

Alexander Belopolsky wrote:
> On Tue, Aug 23, 2016 at 7:55 PM, Paul Eggert <eggert at cs.ucla.edu> wrote:
>>
>> +    ...  For Europe/Moscow the
>> +    invented abbreviation MSM was replaced by +05, whereas MSK and MSD
>> +    were kept as they are not our invention and are widely used.
>
> 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. 
In the current go-round I am looking at integer-hour offsets, as they are the 
most important for contemporaneous time stamps. Addressing the non-integer 
offsets will be a bit more tricky and I plan to take it up later.

> BTW, the earlier Soviet decrees have been collected on the istmat.info web
> site.  For example, (transition date: url):
>
> Dec 28, 1917: http://istmat.info/node/28137
> May 31, 1918: http://istmat.info/node/30001
> May 31, 1919: http://istmat.info/node/37949
> Feb 14, 1921: http://istmat.info/node/45840
> May 20, 1921: http://istmat.info/node/45949
>
> You may want to reference these documents in the source files.

Thanks for the pointers. These indicate that our old abbreviations are dubious 
too. The first decree talks about "Петроградского гражданского времени" 
(Petrograd civil time), for example, and doesn't give DST a particular name. For 
now, I added them to the commentary by installing the attached experimental patch.
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