Kay-Uwe Genz <[EMAIL PROTECTED]> writes:
> Is this a bug or is this me mistake?

Yours I think.  Type TIME WITH TIME ZONE stores a time of day
(from 00:00:00 to 23:59:59) plus a time zone (some offset east
or west of Greenwich --- I think we allow up to plus or minus
13 hours).  I see nothing in the concept that would allow for
a negative local-time-of-day.

If you need a signed time-like datatype, maybe INTERVAL is closer
to what you're looking for.

                        regards, tom lane

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