Question

I’m looking for the most succinct solution to the following problem in JavaScript:

I want to determine the number of days that occur between two Dates in JavaScript. I am not looking for the date difference in Days, for example:

Date 1: June 26th 2012 11:05 PM

Date 2: June 27th 2012 12:15 AM

I was using the the following line of code:

var days = Math.ceil((date2 - date1) / 86400000);

My result is 1, I want it to be 2 (counting June 26th and June 27th)

Answer 1

Remove the time portion of the date and then do the date subtraction. See this jsfiddle or the snippet below.

var d1 = new Date('June 26th 2012 11:05 PM'.replace('th',''));
var d2 = new Date('June 27th 2012 12:15 AM'.replace('th',''));

// remove the time portion, set the dates to midnight
d1.setHours(0,0,0,0);
d2.setHours(0,0,0,0);

var diff = Math.ceil((d2 - d1) / 86400000) + 1;

console.log(diff);

​