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Timezone issue - Is it me or is this a massive bug?

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I have a server of which the OS timezone is set to Pacific time
(currently -7).  I run the following query on it

SELECT	now(), now() AT TIME ZONE 'GMT+10:00', now() AT TIME ZONE
'GMT-10:00', now() AT TIME ZONE 'Australia/Melbourne'

I would expect this to return:
 * column 1 - the current time in the pacific (-7) - "2008-06-20
13:09:39.245641-07"
 * column 2 - the GMT +10 - "2008-06-21 06:09:39.245641"
 * column 3 - the GMT -10 - "2008-06-20 10:09:39.245641"
 * column 4 - the current time in Melbourne Australia - "2008-06-21
06:09:39.245641"

Instead it returns:
 * column 1 - the current time in the pacific (-7) ("2008-06-20
13:09:39.245641-07" - CORRECT)
 * column 2 - the current time MINUS 10 ("2008-06-20 10:09:39.245641" - WRONG)
 * column 3 - the current time PLUS 10 ("2008-06-21 06:09:39.245641" - WRONG)
 * column 4 - the current time in Melbourne Australia ("2008-06-21
06:09:39.245641" - CORRECT)


Am I missing something obvious?  Seems when I specify GMT+10:00 it
returns GMT-10:00 and vice versa.  Note that column 2 & 3 are
timestamp withOUT timezone while 1 & 4 are timestamp WITH timezone.
But I still see this as totally wrong.

Regards,
Collin Peters


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