> On Wed, Sep 1, 2021 at 3:25 PM Tom Lane <
tgl@sss.pgh.pa.us> wrote:
> >
> > John Naylor <
john.naylor@enterprisedb.com> writes:
> > > On Wed, Sep 1, 2021 at 2:44 PM Tom Lane <
tgl@sss.pgh.pa.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.
>
> Attached is a draft doc patch using the above examples. Is there anything else that would be useful to mention?
Any thoughts on the doc patch?
--
John Naylor
EDB:
http://www.enterprisedb.com