I am seeing strange results from date/interval computations involving
months.
I get the correct answers because I have a negative setting relative to
GMT. Here are my results with TZ=EST5EDT:test=> select '2001/3/1'::date - '1 month'::interval; ?column?
------------------------2001-02-01 00:00:00-05(1 row)
With GMT it is OK too:
test=> select '2001/3/1'::date - '1 month'::interval; ?column? ------------------------ 2001-02-01
00:00:00+00(1row)
However, with GMT+1 I see a big failure:
test=> select '2001/3/1'::date - '1 month'::interval; ?column? ------------------------ 2001-01-29
00:00:00+01(1row)
Why does it say 2001-01-29?
This is interesting:test=> select '2001/7/1'::date - '1 month'::interval; ?column?
------------------------2001-05-31 00:00:00+02(1 row)test=> select '2001/8/1'::date - '1 month'::interval;
?column? ------------------------ 2001-07-01 00:00:00+02(1 row)
Because August and July have the same number of months, it worked. I am
going to research this but someone may know the solution already.
-- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610)
853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill,
Pennsylvania19026
