Re: date_trunc() in a specific time zone

On 10/29/2018 04:18 PM, Vik Fearing wrote:
> A use case that I see quite a lot of is needing to do reports and other
> calculations on data per day/hour/etc but in the user's time zone.  The
> way to do that is fairly trivial, but it's not obvious what it does so
> reading queries becomes just a little bit more difficult.

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')

. Especially since you still will have to do the second for other time 
related functions like date(). Maybe a slight win in that new users who 
read the manual will be reminded that they need to care about time 
zones, but I also see a value in teaching users about how to use "AT 
TIME ZONE".

Andreas