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

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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 is below

Solution 1:

If you want to use forward slashes in the format, the you need to escape with back slashes in the regex:

var pattern =/^([0-9]{2})\/([0-9]{2})\/([0-9]{4})$/;

http://jsfiddle.net/P9TER/


Solution 2:

I suggest using moment.js which provides an easy to use method for doing this.

interactive demo

function validate(date){
    var eighteenYearsAgo = moment().subtract(18, "years");
    var birthday = moment(date);

    if (!birthday.isValid()) {
        return "invalid date";    
    }
    else if (eighteenYearsAgo.isAfter(birthday)) {
        return "okay, you're good";    
    }
    else {
        return "sorry, no";    
    }
}

To include moment in your page, you can use CDNJS:

<script src="//cdnjs.cloudflare.com/ajax/libs/moment.js/2.4.0/moment.min.js"></script>

Solution 3:

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.


Solution 4:

If you want to use forward slashes in the format, the you need to escape with back slashes in the regex:

   
var dateformat = /^(0?[1-9]|1[012])[\/\-](0?[1-9]|[12][0-9]|3[01])[\/\-]\d{4}$/;

Solution 5: 

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script>
    function dateCheck() {
        debugger;

        var inputValues = document.getElementById('dateInput').value + ' ' + document.getElementById('monthInput').value + ' ' + document.getElementById('yearInput').value;

        var d = new Date();
        var n = d.getHours();
        var m = d.getMinutes();
        var p = d.getSeconds();

        var date = document.getElementById("dateInput").value;
        var month = document.getElementById("monthInput").value;
        var year = document.getElementById("yearInput").value;

        var dateCheck = /^(0?[1-9]|[12][0-9]|3[01])$/;
        var monthCheck = /^(0[1-9]|1[0-2])$/;
        var yearCheck = /^\d{4}$/; 

        if (month.match(monthCheck) && date.match(dateCheck) && year.match(yearCheck)) {

            var ListofDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

            if (month == 1 || month > 2) {
                if (date > ListofDays[month - 1]) {
                    alert('Invalid date format!');
                    return false;
                }
            }

            if (month == 2) {
                var leapYear = false;
                if ((!(year % 4) && year % 100) || !(year % 400)) {
                    leapYear = true;
                }

                if ((leapYear == false) && (date >= 29)) {
                    alert('Invalid date format!');
                    return false;
                }

                if ((leapYear == true) && (date > 29)) {
                    alert('Invalid date format!');
                    return false;
                }

            }
            var flag = 1
        }

        else {
            alert("invalid date");


        }
        if (flag == 1) {
            alert("the date is:" + inputValues + " " + "The time is:" + n + ":" + m + ":" + p);
        }

        clear();
    }

    function clear() {
        document.myForm.dateInput.value = "";
        document.myForm.monthInput.value = "";
        document.myForm.yearInput.value = "";
    }


</script>

</head>


<body>  
    <div>  
        <form name="myForm" action="#">   
            <table>
                <tr>
                    <td>Enter Date</td>
                    <td><input type='text' name='dateInput' id="dateInput" placeholder="Date"  maxlength="2" onclick="dateCheck(document.myForm.dateInput)" onkeypress="return event.charCode === 0 || /\d/.test(String.fromCharCode(event.charCode));"/></td>
                    <td><span id="span1"></span></td>
                </tr>
                <tr>
                    <td>Enter Month</td>
                    <td><input type='text' name='monthInput' id="monthInput" placeholder="Month"  maxlength="2" onclick="dateCheck(document.myForm.dateInput)" onkeypress="return event.charCode === 0 || /\d/.test(String.fromCharCode(event.charCode));"/></td>
                    <td><span id="span2"></span></td>
                </tr>
                <tr>
                    <td>Enter Year</td>
                    <td><input type='text' name='yearInput' id="yearInput" placeholder="Year" minlength="4" maxlength="4" onclick="dateCheck()" onkeypress="return event.charCode === 0 || /\d/.test(String.fromCharCode(event.charCode));"/></td>
                    <td><span id="span3"></span></td>
                </tr>

                <tr>
                    <td></td>
                    <td><input type="submit" name="submit" value="Submit" onclick="dateCheck()"/></td>
                </tr>
            </table>
        </form>  
    </div>   
</body>  
</html>
<td>

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