I have created a project in the asp.net. In the register form, i have put the control(dropdown list) that ask user to enter his/her birthdate and if user selects wrong date then message in the form of label will be displayed as "invalid date". Now my problem is for some dates selected project in the my laptop shows that msg of "invalid date" and for same dates selected same project in my desktop considers it as valid dates. So is there any settings that shud be done in my laptop? Bcoz error occurs only when project runs in my laptop!