Re: BUG #1993: Adding/subtracting negative time intervals - Mailing list pgsql-bugs

Klint Gore <kg@kgb.une.edu.au> writes:
> That's changed since v7.4.7

Yup.  '1 week' = '7 days' which is no longer the same as 7*24 hours.
In particular, as of 8.1 local noon plus one day is still local noon,
even if there was a DST change in between.  Adding 24 hours, on the
other hand, might give 11am or 1pm.

            regards, tom lane