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

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臣服心动

2020-12-01 12:13

<!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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心在旅途

2020-12-01 12:13

It is two problems - is the slashes the right places and is it a valid date. I would suggest you catch input changes and put the slashes in yourself. (annoying for the user)

The interesting problem is whether they put in a valid date and I would suggest exploiting how flexible js is:

function isValidDate(str) {
  var newdate = new Date();
  var yyyy = 2000 + Number(str.substr(4, 2));
  var mm = Number(str.substr(2, 2)) - 1;
  var dd = Number(str.substr(0, 2));
  newdate.setFullYear(yyyy);
  newdate.setMonth(mm);
  newdate.setDate(dd);
  return dd == newdate.getDate() && mm == newdate.getMonth() && yyyy == newdate.getFullYear();
}
console.log(isValidDate('jk'));//false
console.log(isValidDate('290215'));//false
console.log(isValidDate('290216'));//true
console.log(isValidDate('292216'));//false

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无人共我

2020-12-01 12:13
with leading zero for day and month
```
var pattern =/^(0[1-9]|1[0-9]|2[0-9]|3[0-1])\/(0[1-9]|1[0-2])\/([0-9]{4})$/;
```
and with both leading zero/without leading zero for day and month
```
var pattern =/^(0?[1-9]|1[0-9]|2[0-9]|3[0-1])\/(0?[1-9]|1[0-2])\/([0-9]{4})$/;
```
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情书的邮戳

2020-12-01 12:14

var date=/^[0-9]{1,2}\-[0-9]{1,2}\-[0-9]{1,4}$/;

if(!date.test(form.date.value))

alert("Enter correct date");

else
alert(" working");

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