| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Michael Glaesemann <grzm(at)seespotcode(dot)net> |
| Cc: | Wei Weng <wweng(at)kencast(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Is there a better way to do this? |
| Date: | 2007-08-29 00:30:20 |
| Message-ID: | 16118.1188347420@sss.pgh.pa.us |
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| Lists: | pgsql-general |
Michael Glaesemann <grzm(at)seespotcode(dot)net> writes:
> Note that interval '1 day' is not equal to interval '24 hours'. '1
> day' can be 23 or 25 hours across daylight saving time boundaries.
When you are adding to timestamp without time zone, they *are*
interchangeable, since no daylight-savings arithmetic is involved.
Michael's right for the case of adding to timestamp with time zone,
though.
> Do you *really* want timestamp without time zone?
I agree with that comment --- you should at least think hard
about what you are trying to represent. The "date" type is also
worth considering if time-of-day isn't so important to you.
regards, tom lane
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