JavaScript parse() Method: Date Object

Last update on August 19 2022 21:50:37 (UTC/GMT +8 hours)

Description

The parse() method takes a date string (such as "Jan 21, 1987") and returns the number of milliseconds since January 1, 1970, 00:00:00, local time.

Version

Implemented in JavaScript 1.3

Syntax

Date.parse(stringDate)

Parameter

stringDate: A string representing a date.

Example:

In the following web document parse() method converts the string representation of the date "Mon, 12 May 1989 11:33:19" to milliseconds.

<!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 - Date.parse() method example</title>
</head>
<body>
<h1 style="color: red">JavaScript date object : Date.parse() method</h1>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
document.write("The milliseconds of the string  'Mon, 12 May 1989 11:33:19 ' is : "+ 
Date.parse("Mon, 12 May 1989 11:33:19"))
//]]>
</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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Next: JavaScript setDate() 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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