Running 8.4.6 hosted on Linux, if I do this...
SELECT to_char('2011-03-01 12:00' AT TIME ZONE 'GMT0BST', 'HH24:MI TZ');
to_char
---------
12:00
(1 row)
..I don't get a timezone- I can live with that.
If I do this...
SELECT to_char(('2011-03-01 12:00' AT TIME ZONE 'GMT0BST')::TIMESTAMP
WITH TIME ZONE, 'HH24:MI TZ');
to_char
-----------
12:00 GMT
(1 row)
..then I get the GMT time with a timezone 'GMT'- that's what I want.
But if I do this...
SELECT to_char(('2011-04-01 12:00' AT TIME ZONE 'GMT0BST')::TIMESTAMP
WITH TIME ZONE, 'HH24:MI TZ');
to_char
-----------
13:00 GMT
(1 row)
..then I get the time corrected for daylight saving- which is what I
want- but the timezone doesn't indicate that daylight saving has been
applied.
In the general case, how can I get TZ indicating whether daylight saving
is in effect? Alternatively, is there a flag I can retrieve indicating
that a timestamp has been corrected for DST so that I can select an
alternative name for display?
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
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