JQuery Date.parse function implementation

12.6k Views Asked by manasi At 04 April 2025 at 18:16

I am using the daterangepicker component of jquery. The Date.parse() function of jquery gives some weird output when i pass the date as "Jan 2011". Here's the sample output for different use cases:

Code snippet:

var dateStr = "Jan 2011";
var dt = Date.parse(dateStr);
alert(dt.getDate() + "/" + dt.getMonth());

Output :

dateStr = "Jan 2011"  : output = 25/0 (todays date is 25 feb 2011)
dateStr = "Feb 2011"  : output = 1/1
dateStr = "Dec 2011"  : output = 1/11

So for any other month that Jan, the date is set to 1st date of the month, whereas only for jan the date is set to the current date.

Any idea what could be the reason for this?

Original Q&A

There are 2 best solutions below

Neeraj Pathak On 28 July 2017 at 10:18

function myFunction() {
    var d = Date.parse("Jan 2011");
    document.getElementById("demo").innerHTML = d;
}

<!DOCTYPE html>
<html>
<body>

<p>Click the button to display milliseconds between a specified date and Jan 2011.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

</body>
</html>

The parse() method parses a date string and returns the number of milliseconds between the date string and midnight of Jan 20111

Ilya On 24 April 2013 at 15:03

It's not standart Date.parse function in you example.
Standart parse function returns numeric result, not Date object.
Javascript parse() Method

In you example parse function returns Date object.
function Date.parse was redefined in you code. Please check it.

Standart parse function always returns first day in month in your case

JQuery Date.parse function implementation

There are 2 best solutions below

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