I need to set up an input mask for a Date/Time data type
such that it will accept a year only if the month and day
are not available (e.g., __/__/1990).  I've tried using
the 99/99/0000 input mask, but it will not accept spaces
for the month and year.  If I use a Text data type with a
99/99/0000 input mask, then it will accept spaces but I
lose the ability to limit the month between 01 and 12, and
the day between 01 and 31.  Do you have any suggestions?  
I'm at a loss!

Thanks!

Jennifer