I have one field, "DateStartedSchool". I have an unbound control, "TimeatSchool" linked to a function that calculates the time a child has been at school in years and months. This part works fine BUT I can't figure out how to stop the calculation after the child has been at school for more than 13 years.<br><br>Variations on DateStartedSchool - Now() > 13 etc don't seem to work.<br><br>Thanks VM