Re: mark the timestamptz variant of date_bin() as stable

John Naylor <john(dot)naylor(at)enterprisedb(dot)com> writes:
> On Wed, Sep 1, 2021 at 2:44 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> I see that these two answers are both exactly multiples of 24 hours away
>> from the given origin. But if I'm binning on the basis of "days" or
>> larger units, I would sort of expect to get local midnight, and I'm not
>> getting that once I cross a DST boundary.

> Hmm, that's seems like a reasonable expectation. I can get local midnight
> if I recast to timestamp:

> # select date_bin('1 day', '2021-11-10 00:00 +00'::timestamptz::timestamp,
> '2021-09-01 00:00 -04'::timestamptz::timestamp);
> date_bin
> ---------------------
> 2021-11-09 00:00:00
> (1 row)

Yeah, and then back to timestamptz if that's what you really need :-(

> It's a bit unintuitive, though.

Agreed. If we keep it like this, adding some documentation around
the point would be a good idea I think.

regards, tom lane