Javascript Date Validation ( DD/MM/YYYY) & Age Checking

Question

I\'ve started to work on Javascript recently. What I am testing is checking the DoB in valid format. Next step will be checking the age.

What my HTML code includes

Answer 1

I'd utilize the built in Date object to do the validation for me. Even after you switch from - to / you still need to check whether the month is between 0 and 12, the date is between 0 and 31 and the year between 1900 and 2013 for example.

function validateDOB(){

    var dob = document.forms["ProcessInfo"]["txtDOB"].value;
    var data = dob.split("/");
    // using ISO 8601 Date String
    if (isNaN(Date.parse(data[2] + "-" + data[1] + "-" + data[0]))) {
        return false;
    }

    return true;
}

See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse#Example:_Using_parse for more information.