Intensively Used Function In View Needs A Minimum And Maximum From A Table

I have a problem (who not?) with a function which i'm using in a view.
This function is a function which calculates a integer value of a
date. For example: '12/31/2004 00:00:00" becomes 20041231. This is
very handy in a datawarehouse and performes superfast. But here is my
problem.

My calendar table is limited by a couple of years. What happens is
that sometimes a value is loaded which is not in the range of the
Calendardate. What we want to do is when a date is loaded is that this
function insert a minimum date when date < minimum date and a maximum
date when date > maximum date.

Yes i know you're thinking : This is datamanipulation and yes this is
true. But now we loose information in our cubes and reports by inner
joining. So if we can use a minimum and a maximum than a user would
say: "This is strange, a lot of values on 1980/1/1!" instead of "I
think that i have not all the data!"

Greetz

Hennie