You can validate date values with Value Constraint rule by puting date in the value field of the check:

and providing format of the date in the Date Format field of the Field Details form:

During validation all values in the field will be checked to be compliant with data format, which means that you will need only one check to catch both value errors and format errors.

Example

Value < 10/10/2008 will catch following data errors: Any value greater the 10/10/2008 as an error Any value that has format different from dd/MM/yyyn