pgsql-bugs(at)postgresql(dot)org writes:
> When I try to insert in a field of the type timestamp value 2002-10-13 00:00:00 occurs this value is modified for 2002-10-12 23:00:00
(a) what timezone are you running in?
(b) does it happen on only that date? If so, is that a daylight-savings
transition day in your timezone?
regards, tom lane