Re: ISO8601 vs POSIX offset clarification

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Bharanee Rathna <deepfryed(at)gmail(dot)com>
Cc: pgsql-general(at)lists(dot)postgresql(dot)org
Subject: Re: ISO8601 vs POSIX offset clarification
Date: 2017-12-04 02:55:53
Message-ID: 21940.1512356153@sss.pgh.pa.us
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Bharanee Rathna <deepfryed(at)gmail(dot)com> writes:
> the documentation around how numeric offsets are parsed from strings is a
> bit confusing, are they supposed to be treated as ISO8601 or POSIX ?

Our documentation about this says clearly that Postgres considers offsets
to be ISO (positive-east-of-Greenwich) everywhere except in POSIX-style
time zone names.

> The Table 8-12. Time Zone Input section at
> https://www.postgresql.org/docs/9.3/static/datatype-datetime.html seems to
> imply that numeric offsets would be treated as ISO8601.

How do you read an entry such as

-8:00 | ISO-8601 offset for PST

as being in any way vague about which convention the "-8" is read in?

regards, tom lane

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