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Re: Is TimeZone applied with TIMESTAMP WITHOUT TIME ZONE and Extract( EPOCH ...)? - Mailing list pgsql-general

From bubba postgres
Subject Re: Is TimeZone applied with TIMESTAMP WITHOUT TIME ZONE and Extract( EPOCH ...)?
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Msg-id AANLkTim166cQtLX0NJj3nPEnFy+9LV11t_yGsrvOVJ4n@mail.gmail.com
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In response to Is TimeZone applied with TIMESTAMP WITHOUT TIME ZONE and Extract( EPOCH ...)?  (bubba postgres <bubba.postgres@gmail.com>)
Responses Re: Is TimeZone applied with TIMESTAMP WITHOUT TIME ZONE and Extract( EPOCH ...)?  (bubba postgres <bubba.postgres@gmail.com>)
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Looks like a quick search says I need to specify the timezone...

On Thu, Mar 17, 2011 at 11:22 AM, bubba postgres <bubba.postgres@gmail.com> wrote:

I'm noticing some interesting behavior around timestamp and extract epoch, and it appears that I'm getting a timezone applied somewhere.

Specifically, If I do:
select EXTRACT( EPOCH FROM '2010-01-31 00:00:00'::TIMESTAMP WITHOUT TIME ZONE ); == 1264924800
select EXTRACT( EPOCH FROM '2010-04-01 00:00:00'::TIMESTAMP WITHOUT TIME ZONE ); == 1270105200

Now if I do something similar in Java.. using a GregorianCalendar, with "GMT" TimeZone.
I get
Hello:2010-01-31 00:00:00.000 (UTC)
Hello:1264896000000

Hello:2010-04-01 00:00:00.000 (UTC)
Hello:1270080000000

Which gives a difference of 8 and 7 hours respectively, so both a timezone and a DST shift are at work here.

Is this the expected behavior of extract epoch, is there a way to get it to always be in GMT?





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