future date and months having 30 and 31 days.and february validation too.

You may want to use an array with the number of days for each month. Each month is numbered 0 -11 (January is 0 and December is 11), so your array might look like this:

months[0] = 31; // January
months[1] = 28; // February; if not a leap year
months[2] = 31; // March
months[3] = 30; // April

...and so forth. Hope this helps.