| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> |
| Cc: | "Trevor Talbot" <quension(at)gmail(dot)com>, Magne MÃ|hre <Magne(dot)Mahre(at)Sun(dot)COM>, "Peter Eisentraut" <peter_e(at)gmx(dot)net>, "Aidan Van Dyk" <aidan(at)highrise(dot)ca>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Timezone database changes |
| Date: | 2007-10-10 21:12:34 |
| Message-ID: | 24310.1192050754@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
"Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> writes:
> It's been a while since I looked at it, but my recollection is that
> much of the standard date/time math which people assert can't handle
> practical use cases do work if the timestamps and times WITH TIME
> ZONE have a time zone in the offset-from-UTC format.
Certainly --- as long as you are considering a fixed UTC offset, the
standard does what it claims to. The knock on it is that in the real
world people want sane behavior with real-world timezone definitions
that have non-constant UTC offsets.
As an example, timestamptz '2007-01-01 00:00 -05' + interval '6 months'
must yield 2007-07-01 00:00 -05 according to the spec, AFAICS; but most
people living in the EST5EDT zone would prefer to get midnight -04.
There are probably some folk in South America who'd prefer midnight
-06. (Looks at a map ... hm, maybe not, but certainly Europe vs
Africa would produce some such examples.)
regards, tom lane
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