Horton

Re: date_trunc() in a specific time zone

Andreas Karlsson <andreas@proxel.se>

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From: Andreas Karlsson <andreas@proxel.se>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Vik Fearing <vik.fearing@2ndquadrant.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2018-10-29T23:18:41Z
Lists: pgsql-hackers 
On 10/29/2018 04:36 PM, Tom Lane wrote:
> Andreas Karlsson <andreas@proxel.se> writes:
>> Hm, I am not sure if I see any major win from writing
>> date_trunc('day', timestamptz '2001-02-16 20:38:40+00', 'Australia/Sydney')
>> instead of
>> date_trunc('day', timestamptz '2001-02-16 20:38:40+00' AT TIME ZONE
>> 'Australia/Sydney')
> 
> The latter would give you timestamp without time zone, whereas I think
> what Vik wants is timestamp with time zone.  Yeah, you could then convert
> it back with a second application of AT TIME ZONE 'Australia/Sydney',
> but that's both inefficient and mighty confusing.

Sloppy reading on my part, thanks for pointing it out.

Andreas

Commits

  1. Add a timezone-specific variant of date_trunc().