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JavaScript Date prototype Property

JavaScript prototype property is used to add new properties and methods to the Date() object. It is used to represent the prototype for the Date constructor.

Syntax:

Date.prototype.name = value

Browser Support

Property	Chrome	Edge	Firefox	Safari	Opera
prototype	Yes	Yes	Yes	Yes	Yes

Here is an example of JavaScript Date prototype property:

<html>
<body>
<p>Click the button to see the Output.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
Date.prototype.myMet = function() {
  if (this.getMonth() == 0){this.myProp = "January"};
  if (this.getMonth() == 1){this.myProp = "February"};
  if (this.getMonth() == 2){this.myProp = "March"};
  if (this.getMonth() == 3){this.myProp = "April"};
  if (this.getMonth() == 4){this.myProp = "May"};
  if (this.getMonth() == 5){this.myProp = "June"};
  if (this.getMonth() == 6){this.myProp = "July"};
  if (this.getMonth() == 7){this.myProp = "August"};
  if (this.getMonth() == 8){this.myProp = "September"};
  if (this.getMonth() == 9){this.myProp = "October"};
  if (this.getMonth() == 10){this.myProp = "November"};
  if (this.getMonth() == 11){this.myProp = "December"};
};
function myFunction() 
{
  var d = new Date();
  d.myMet();
  document.getElementById("demo").innerHTML = d.myProp;
}
</script>
</body>
</html>

Output:

Click the button to see the Output.

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