What's the best way to calculate date difference in Javascript

I doing a function in Javascript like the VisualBasic DateDiff.

You give two dates and the returning time interval (Seconds, Minutes, Days, etc...)

DateDiff(ByVal Interval As Microsoft.VisualBasic.DateInterval, _
  ByVal Date1 As Date, ByVal Date2 As Date) as Long

So what's the best way to calculate the difference of Javascript Dates?

Answers:

Answer

If you follow this tutorial, one way is to use:

Date.getTime()

You will find a full javascript function here, complete with date validation.

That being said, as commented by Rafi B. 5 years later, "Get difference between 2 dates in javascript?" is more precise.

var _MS_PER_DAY = 1000 * 60 * 60 * 24;

// a and b are javascript Date objects
function dateDiffInDays(a, b) {
  // Discard the time and time-zone information.
  var utc1 = Date.UTC(a.getFullYear(), a.getMonth(), a.getDate());
  var utc2 = Date.UTC(b.getFullYear(), b.getMonth(), b.getDate());

  return Math.floor((utc2 - utc1) / _MS_PER_DAY);
}
Answer

Use the Date object like so:

function DateDiff(var /*Date*/ date1, var /*Date*/ date2) {
    return date1.getTime() - date2.getTime();
}

This will return the number of milliseconds difference between the two dates. Converting it to seconds, minutes, hours etc. shouldn't be too difficult.

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