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Re: Indicated Epoch 0 is incorrect - Mailing list pgsql-docs

From Steve Crawford
Subject Re: Indicated Epoch 0 is incorrect
Date
Msg-id CAEfWYyzs6sVF1ftryEwNfwpx7pzsjYv=7=dPXDUkQxx22uXDqA@mail.gmail.com
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In response to Indicated Epoch 0 is incorrect  (ian@thepathcentral.com)
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The docs are correct. When you convert a string to a timestamp with time zone it will interpret the string in *your* time zone which is apparently offset from UTC.

Try:
select extract(epoch from timestamp with time zone '1970-01-01 00:00:00-00');
or
select extract(epoch from timestamp with time zone '1970-01-01 00:00:00 UTC');

Note the explicit definition of timezone offset of zero or time zone of UTC.

Cheers,
Steve

On Fri, Jun 3, 2016 at 4:44 PM, <ian@thepathcentral.com> wrote:
The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.1/static/functions-datetime.html
Description:

Per /docs/current/static/functions-datetime.html (and earlier), epoch is
defined as:

&quot;For date and timestamp values, the number of seconds since 1970-01-01
00:00:00 UTC&quot;.

The correct value to obtain 0 is as follows:

SELECT EXTRACT(EPOCH FROM TIMESTAMP WITH TIME ZONE &#39;1970-01-01 8:00:00.0&#39;)

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