"Kevin Grittner" <[EMAIL PROTECTED]> 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

---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not

Reply via email to