[tz] timezone history of Uruguay

[Michael Deckers]

   On 2018-02-16 17:58, Paul Eggert proposed:


> +# .......  Assume transitions at 24:00 on the specified days until 
> Ley No.
> +# 7919 of 1926-03-05 ended this arrangement, repealing all "laws and 
> other
> +# provisions which oppose" it, resulting immediately in year-round 
> UT-03:30.
> +# (Since we don't know the time at which the change became law, 
> assume clocks
> +# were changed at 24:00 that evening.  Almanaque 2018 is a bit 
> hand-wavey here,
> +# anyway.)
> +#.......
> +# https://www.impo.com.uy/diariooficial/1926/03/10/2
> +#.......
> +Rule    Uruguay    1926    only    -    Mar     5    24:00    0  -
>
   The proposed date of the switch, 1926-03-06, would be before the 
publication
   of the law, which seems to be unlikely. Anyway, the Almanaque 2018 
explicitly
   says that the switch was on 1926-04-01, the date specified by the law 
of 1923,
   and so does the Resolución of 1926-03-11 published in
       [http://www.impo.com.uy/diariooficial/1926/03/18/2].
   I propose that tzdb follow these sources, rather than make an estimate.

   Michael Deckers.