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I'm trying to convert a date in javascript from MM/dd/yyyy to yyyy/MM/dd

so this works:

var d = new Date("08/08/2012");
dateString = d.getFullYear() + "/" + d.getMonth() + "/" + d.getDate();
document.write(dateString);

output = 2012/7/8

///////////////////////////////////////////////////

this does not:

var dateString = "08/08/2012";
var d = new Date(dateString);
dateString = d.getFullYear() + "/" + d.getMonth() + "/" + d.getDate();
document.write(dateString);

and neither does this:

var dateString = "08/08/2012";
var d = Date.parse(dateString);
dateString = d.getFullYear() + "/" + d.getMonth() + "/" + d.getDate();
document.write(dateString);

how do I make it work with a string variable? thanks

~Myy

I'm trying to convert a date in javascript from MM/dd/yyyy to yyyy/MM/dd

so this works:

var d = new Date("08/08/2012");
dateString = d.getFullYear() + "/" + d.getMonth() + "/" + d.getDate();
document.write(dateString);

output = 2012/7/8

///////////////////////////////////////////////////

this does not:

var dateString = "08/08/2012";
var d = new Date(dateString);
dateString = d.getFullYear() + "/" + d.getMonth() + "/" + d.getDate();
document.write(dateString);

and neither does this:

var dateString = "08/08/2012";
var d = Date.parse(dateString);
dateString = d.getFullYear() + "/" + d.getMonth() + "/" + d.getDate();
document.write(dateString);

how do I make it work with a string variable? thanks

~Myy

• javascript
• date
• formatting

Share Improve this question Follow asked Aug 9, 2012 at 20:17 MyyMyy 18.5k1111 gold badges4040 silver badges5757 bronze badges 3

• What does the browser's console log when it tries to execute the code that doesn't work? – Jordan Commented Aug 9, 2012 at 20:22
• Are you saying that you want 08/08/2012 to print as 2012/7/8 (i.e., with the month changed from 08 to 7)? – Marcelo Cantos Commented Feb 28, 2013 at 0:35
• no, I was having a problem using a string variable vs the new Date() function. – Myy Commented Mar 2, 2013 at 17:22

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3 Answers 3

Sorted by: Reset to default 5

var dateString = "08/08/2012";
var d = new Date(dateString);
dateString = d.getFullYear() + "/" + d.getMonth() + "/" + d.getDate();
document.write(dateString);

That should, and does, work. Keep in mind that JavaScript stores months as a zero-indexed value.

If you want to have leading zeros, then you'll have to do some magic:

var dateString = "08/08/2012";
var d = new Date(dateString);
dateString = d.getFullYear() + "/" + ('0' + (d.getMonth()+1)).slice(-2) + "/" + ('0' + d.getDate()).slice(-2);
document.write(dateString);​

jsFiddle

The reason why your Date.parse( ) example is not working, is because that function returns a timestamp (number of milliseconds since 1970), instead of a Date object. Therefore, you can't call functions like getFullYear() on the timestamp.

If all you need to do is re-order the values, you can do:

var dateString = "08/08/2012";
var dateElements = dateString.split("/");
var outputDateString = dateElements[2] + "/" + dateElements[0] + "/" + dateElements[1];
document.write(outputDateString );

I can confirm with MrSlayer that the code works in jsFiddle.

Your attempts at using Date.parse() should actuall be using Date(String(dateString)).

Don't forget to add 1 for each month.

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