It doesn't sound like data validation, but it could be a worksheet change event that was used to
control data entry. Try opening the workbook with macros disabled.

HTH,
Bernie
MS Excel MVP


"lbrown" wrote in message
...
I have a spreadsheet where a date in the future needs to be entered; however,
when I attempt to enter any date over the year 2009, it doesn't accept the
cell and the entry vanishes. The format is set for date. Am I missing
something else that I should be looking for? The spreadsheet was built
internally but is no longer here.