--- In firebird-support@yahoogroups.com, Svein Erling Tysvaer
<svein.erling.tysvaer@...> wrote:

>
> Why cast to TimeStamp when the datatype is Time?

It was an unfortunate choice of words. I should have said convert to
timestamp. There is obviously no point in casting, rather adding a
start reference date and end reference date to the relative times
before the subtraction.

Adam