Re: Problem with Mauritius summer time (MUST)

Xavier Bugaud <xavier(dot)bugaud(at)gloptv(dot)com> writes:

> Hi,
>
> Mauritius use daylight saving since 2008-11.
> The Olson database has been updated to reflect the Mauritius timezone change
> at the end of 2008 (maybe since tzdata-2008f or tzdata-2008g, not really
> sure).
>
> Postgresql is supposed to have the correct Mauritius timezone since 8.3.5
> (http://www.postgresql.org/docs/8.3/interactive/release-8-3-5.html).
>
> From a debian box configured in the Mauritius timezone :
> $ date
> Wed Mar 4 11:10:01 MUST 2009
> $ psql -c "SELECT '2009-01-01 00:56:00 MUT'::timestamp"
> timestamp
> ---------------------
> 2009-01-01 00:56:00
> (1 row)
>
> $ psql -c "SELECT '2009-01-01 00:56:00 MUST'::timestamp"
> ERROR: invalid input syntax for type timestamp: "2009-01-01 00:56:00 MUST"
>
> As you can see Posgresql does not recognize the "MUST" (Mauritius Summer
> Time).
>
> For reference, here is the content of the tzdata file related to Mauritius :
>
> # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
> Rule Mauritius 1982 only - Oct 10 0:00 1:00 S
> Rule Mauritius 1983 only - Mar 21 0:00 0 -
> Rule Mauritius 2008 max - Oct lastSun 2:00s 1:00 S
> Rule Mauritius 2009 max - Mar lastSun 2:00s 0 -
> # Zone NAME GMTOFF RULES FORMAT [UNTIL]
> Zone Indian/Mauritius 3:50:00 - LMT 1907 # Port Louis
> 4:00 Mauritius MU%sT # Mauritius Time
>
> Is this a bug in Posgresql or am I missing something ?
> This problem was encountered with Postgresql 8.3.5 and 8.3.6.

Hm, you can use Indian/Mauritius to reference the appropriate time zone
directly but that doesn't let you specify Mauritius Summer Time explicitly.

I think the problem is that MUST is missing from the Default
timezone_abbreviations file.

SELECT '2009-01-01 00:56:00 Indian/Mauritius'::timestamp with time zone;
timestamptz
------------------------
2008-12-31 19:56:00+00

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Gregory Stark
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