Get difference between 2 date in javascript?

Question

Hi

How do I get the difference between 2 dates in full days(I don't want any fractions of a day)

var date1 = new Date('7/11/2010');
var date2 = new Date('12/12/2010');
var diffDays = date2.getDate() - date1.getDate(); 
alert(diffDays)

I tried the above but this did not work.

Answer 1

You can't get the difference between two objects. To do what you want, you need to get a timestamp via Date().getTime();

getDate() simply returns a formatted string, and it doesn't make sense to decrease a string by a string.

So, your code would look like:

var date1 = new Date('7/11/2010');
var date2 = new Date('12/12/2010');
var diffDays = date2.getTime() - date1.getTime(); 
alert(diffDays);

Edit: TNi's code should work like a charm. I'm getting fed up at this keyboard typing race...

Answer 2

Here is one way:

var date1 = new Date("7/11/2010");
var date2 = new Date("12/12/2010");
var timeDiff = Math.abs(date2.getTime() - date1.getTime());
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24)); 
alert(diffDays)​;

Observe that we need to enclose the date in quotes. The rest of the code gets the time difference in milliseconds and then divides to get the number of days.

Answer 3

var date1 = new Date("7/11/2010");
var date2 = new Date("8/11/2010");
var diffDays = parseInt((date2 - date1) / (1000 * 60 * 60 * 24)); 

alert(diffDays )