[tz] Rule Russia incorrect

[Alan Barrett]

On Mon, 31 Oct 2011, Petr Machata wrote:
> So on Mar 27, Moscow stopped observing ruleset Russia, and 
> instead changed to permanent offset of +4:00.  It's done this 
> way, because permanent daylight saving is not really _saving_, 
> it's simply a new zone.

Yes, that what the tzdata files say.  But is that an accurate 
reflection of what happened on the ground?  The relevant 
legislation hadn't yet been passed on 27 March 2011.

Wouldn't it be more accurate to say that there was a transition 
to daylight savings time on 27 March 2011, and then another 
transition from {base offset = +03:00, extra DST offset = 01:00} 
to {base offset = +04:00, no DST} on some later date when the new 
legislation took effect?

(And for some timezones, several back and forth transitions as 
the legislators changed their minds, each transition affecting 
our notion of whether or not DST was in effect, but not affecting 
the setting of clocks that lack isdst indicators and timezone 
abbreviation indicators.)

--apb (Alan Barrett)