JavaScript setDate() Method: Date Object
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 |
See also:
JavaScript Core objects, methods, properties.
Previous: JavaScript parse() Method: Date Object
Next: JavaScript setFullYear() Method : Date Object
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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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