About Validation

Dear Sir,
i have checked my last evaluated (Loop assignment)
and given comment:No Proper validation done for last question. (date, month and year)
so my doubt is how can i do proper validation for this?
please guide me...

You are right Sir,
But whatever asked in the Question i provided the same...!!
in that question did`t asked for form Validation
if mentioned, i could provide validation function for that..

Hi Santosh,

After getting date, month and year values from user. Do proper validation like,

date - check whether the number is in between 1-31. Do number validation
month - check whether the number is in between 1-12. Do number validation.
year - check length is of 4 digit, whether user entered number, check for some range like 1970-2010.

In all the above else cases alert error messages.