date validation for textbox?

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Javascript

jQuery

I tried with this code...

function IsValidDateTime(Day, Mn, Yr) {
        var DateVal = Day + "/" + Mn + "/" + Yr;
        var dt = new Date(DateVal);

        if (dt.getDate() != Day) {
            alert('Invalid Date');
            return (false);
        }
        else if (dt.getMonth() != Mn) {
            //this is for the purpose JavaScript starts the month from 0
            alert('Invalid Date');
            return (false);
        }
        else if (dt.getFullYear() != Yr) {
            alert('Invalid Date');
            return (false);
        }


        return (true);
    }

Here it's working fine...i mean it cannot enter type of charaters from the keyboard,but if i delete the number.. then it shows an exption means date format is not correct..so...i want to enter date from calender..but no modifications from the key board..please help me