HTML | DOM Input Datetime required Property

Last Updated : 24 Jan, 2022

The Input Datetime required property is used to check whether a datetime field must be filled out or not before submitting a form.

Syntax:

For returning the required property:

datetimeObject.required

For setting the required property:

 datetimeObject.required = true|false

Property Value:

true|false : It is used to specify whether a datetime field should be a required part of a form submission or not. It is false by default.

Return Values: It returns a Boolean value which represents that the input Datetime field is required or not.

Below program illustrates the Datetime required property :
Example 1: Finding out if a datetime field must be filled out before submitting a form or not.

html

<!DOCTYPE html>
<html>
 
<head>
    <title>Input Datetime required Property in HTML</title>
    <style>
        h1 {
            color: green;
        }
         
        h2 {
            font-family: Impact;
        }
         
        body {
            text-align: center;
        }
    </style>
</head>
 
<body>
 
    <h1>GeeksforGeeks</h1>
    <h2>Input Datetime required Property</h2>
    <br>
 
    <form action="/initials.php">
        Date of Birth:
        <input type="datetime" id="Test_Datetime" name="DOB" required>
        <input type="submit">
    </form>
 
     
 
 
<p>To find out if the datetime field must be filled out before 
        submitting the form, double-click the "Check" button.</p>
 
 
 
 
    <button ondblclick="My_Datetime()">Check</button>
 
    <p id="test"></p>
 
 
 
 
    <script>
        function My_Datetime() {
            var d = document.getElementById("Test_Datetime").required;
            document.getElementById("test").innerHTML = d;
        }
    </script>
 
</body>
 
</html>
                                          

Output:
Before:

After clicking the button:

Example 2: Setting the value of the required attribute

HTML

<!DOCTYPE html>
<html>
 
<head>
    <title>Input Datetime required Property in HTML</title>
    <style>
        h1 {
            color: green;
        }
         
        h2 {
            font-family: Impact;
        }
         
        body {
            text-align: center;
        }
    </style>
</head>
 
<body>
 
    <h1>GeeksforGeeks</h1>
    <h2>Input Datetime required Property</h2>
    <br>
 
    <form action="/initials.php">
        Date of Birth:
        <input type="datetime"
               id="Test_Datetime"
               name="DOB"
               required>
        <input type="submit">
    </form>
 
     
 
 
<p>To set the autofocus property, 
      double-click the "set" button.</p>
 
 
 
 
    <button ondblclick="My_Datetime()">Setk</button>
 
    <p id="test"></p>
 
 
 
 
    <script>
        function My_Datetime() {
            var d = document.getElementById("Test_Datetime").required = 
                "false";
            document.getElementById("test").innerHTML = 
              "The value of the required attribute was changed to:" + d;
        }
    </script>
 
</body>
 
</html>
                                          