From: | "Josh Berkus" <josh(at)agliodbs(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, josh(at)agliodbs(dot)com |
Cc: | pgsql-sql(at)postgresql(dot)org, pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: [SQL] Bug with Daylight Savings Time & Interval |
Date: | 2002-05-21 05:57:46 |
Message-ID: | web-1465902@davinci.ethosmedia.com |
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Lists: | pgsql-bugs pgsql-hackers pgsql-sql |
Tom and Tom,
> This isn't a bug per the existing definition of INTERVAL. '250 days'
> is
> defined as '250*24 hours', exactly, no more no less. When you move
> across a DST boundary you get behavior like the above.
> I've opined several times that interval should account for three
> separate units: months, days, and seconds. But our time-meister
> Tom Lockhart doesn't seem to have taken any interest in the idea.
I beg to differ with Tom L. Even if there were justification for the
addition of an hour to a calculation involving only days, which there
is not, there are two bugs with the existing behavior:
1. You do not lose an hour with the end of DST, you just gain one with
the beginning of it (until you wraparound a whole year, which is really
confusing), which is inconsistent;
2. Even if you justify gaining or losing an hour through DST in a
'+days' operation, changing the TIMEZONE is a bizarre and confusing way
to do it. I don't fly to Colorado on April 7th!
While this needs to be fixed eventually, I need a quick workaround; is
there a way to "turn off" DST behavior in PostgreSQL?
Further, it seems that the whole "Interval" section of Postgres,
possibly one of our greatest strengths as a database, has languished in
the realm of inconsistent behavior due to lack of interest. Is there
anything I can do without learning C?
-Josh Berkus
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