JavaScript setDate() Method: Date Object

Last update on August 19 2022 21:51:08 (UTC/GMT +8 hours)

Description

The setDate() method is used to set the day of the month for a given date according to local time.

Version

Implemented in JavaScript 1.0

Syntax

setDate(dayValue)

Parameter

dayValue : An integer from 1 to 31, representing the day of the month.

Example:

In the following web document setDate() method sets the day of the month to 23 of a given date.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>JavaScript date object - setDate() method example</title>
</head>
<body>
<h1 style="color: red">JavaScript date object : setDate() method</h1>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
user_date = new Date("August 12, 1992 21:20:00")
document.write("Before Date Change : "+user_date+"<BR />")
user_date.setDate(23)
document.write("After changing Aug. 12 to Aug. 23  : "+user_date+"<BR />")
//]]>
</script>
</body>
</html>

View the example in the browser

Supported Browser

Internet Explorer 7	Firefox 3.6	Google Chrome 7	Safari 5.0.1	Opera 10
Yes	Yes	Yes	Yes	Yes

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JavaScript: Tips of the Day

Object.freeze

const box = { p: 10, q: 20 };

Object.freeze(box);

const shape = box;
shape.p = 100;

console.log(shape);

Object.freeze makes it impossible to add, remove, or modify properties of an object (unless the property's value is another object).
When we create the variable shape and set it equal to the frozen object box, shape also refers to a frozen object. You can check whether an object is frozen by using Object.isFrozen. In this case, Object.isFrozen(shape) returns true, since the variable shape has a reference to a frozen object.
Since shape is frozen, and since the value of p is not an object, we cannot modify the property p. p is still equal to 10, and { p: 10, q: 20 } gets logged.

Ref: https://bit.ly/3jFRBje

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