Bruce Momjian <pgman@candle.pha.pa.us> writes:
>> Well, the question is whether justify_days has a sane definition that is
>> different from this. Based on your example, I'm not seeing one.
> Uh, justify days only deals with days <--> months conversions. There is
> no processing for hours. I don't understand your comment.
So it won't guarantee that hours has a consistent sign. If you're OK
with that, then that's fine, let's make justify_days work that way and
then provide a justify_interval that processes all three fields.
regards, tom lane