Unexpected results parsing date strings in JavaScript

Question

I'm working on a JavaScript application. I have two different String dates 31/10/2013 and 1/11/2013 and I create an instance of these two dates with new Date(string).getTime();

But it shows this (the same date ) as the result:

console.log(date_s + " after new date " + date ); 31/10/2013 after new date Fri Nov 1 00:00:00 UTC 2013 1/11/2013 after new date Fri Nov 1 00:00:00 UTC 2013

What's the point of getting the time of dates you just created with NO TIME ? — Laurent S.
– Laurent S., Commented Oct 30, 2013 at 13:48
"31/10/2013" and "1/11/2013" are not valid date strings. The equivalent correct strings should be "2013/10/31" and "2013/11/1". Constructing a Date object with either of your strings results in an invalid date, and calling getTime results in NaN. — James Allardice
– James Allardice, Commented Oct 30, 2013 at 13:48
To clarify the comment from @JamesAllardice, it might work sometimes: "The function first attempts to parse the format of the String according to the rules called out in Date Time String Format (15.9.1.15). If the String does not conform to that format the function may fall back to any implementation-specific heuristics or implementation-specific date formats." That is, to clarify further: it might work for the OP, but it's not a standard universal behavior. — apsillers
– apsillers, Commented Oct 30, 2013 at 13:51

Donovan Charpin · Accepted Answer · 2013-10-30 13:51:04Z

You haven't a valid string in you new Date(string)

Some example to initialize dates

var my_date=new Date(2013,10,31)

and all the documentation on http://www.w3schools.com/js/js_obj_date.asp

Mike Thomsen · Accepted Answer · 2013-10-30 13:50:12Z

31/10/2013 is not a valid date string unless you've got maybe some localization going on. To the default localization settings for en-US, it should be 10/31/2013. What your string means is "month 31 of 2013" which pushes new Date('31/10/2013') to be some time in 2015 because that's where it resolves the date due to that "month 31."

Lionel Chan · Accepted Answer · 2013-10-30 13:58:05Z

If you want an easy solution, try moment.js - a powerful javascript date parser/formatter/validator/manipulator.

In moment, you can parse date with the syntax like this [doc]:

//this will gives you a correct date object moment('31/10/2013', 'DD/MM/YYYY').toDate();

Else, you can always welcome to split and rebuild the date object.

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