How to subtract date/time in JavaScript? [duplicate]

I have a field at a grid containing date/time and I need to know the difference between that and the current date/time. What could be the best way of doing so?

The dates are stored like "2011-02-07 15:13:06".

Solution 1:

This will give you the difference between two dates, in milliseconds

var diff = Math.abs(date1 - date2);

In your example, it'd be

var diff = Math.abs(new Date() - compareDate);

You need to make sure that compareDate is a valid Date object.

Something like this will probably work for you

var diff = Math.abs(new Date() - new Date(dateStr.replace(/-/g,'/')));

i.e. turning "2011-02-07 15:13:06" into new Date('2011/02/07 15:13:06'), which is a format the Date constructor can comprehend.

Solution 2:

You can just substract two date objects.

var d1 = new Date(); //"now"
var d2 = new Date("2011/02/01");  // some date
var diff = Math.abs(d1-d2);  // difference in milliseconds

Solution 3:

Unless you are subtracting dates on same browser client and don't care about edge cases like day light saving time changes, you are probably better off using moment.js which offers powerful localized APIs. For example, this is what I have in my utils.js:

subtractDates: function(date1, date2) {
    return moment.subtract(date1, date2).milliseconds();
},
millisecondsSince: function(dateSince) {
    return moment().subtract(dateSince).milliseconds();
},