JAVASCRIPT: subtracting Time and getting its number of minutes

Question

For Example:

StartTime = '00:10';
EndTIme = '01:20';

These variables are string

Question: How can I Subtract them and returning the span time in minutes?

Hope you can help

Answer 1

Make a function to parse a string like that into minutes:

function parseTime(s) {
   var c = s.split(':');
   return parseInt(c[0]) * 60 + parseInt(c[1]);
}

Now you can parse the strings and just subtract:

var minutes = parseTime(EndTIme) - parseTime(StartTime);

Answer 2

var startTime = "0:10";
var endTime = "1:20";

var s = startTime.split(':');
var e = endTime.split(':');

var end = new Date(0, 0, 0, parseInt(e[1], 10), parseInt(e[0], 10), 0);
var start = new Date(0, 0, 0, parseInt(s[1], 10), parseInt(s[0], 10), 0);

var elapsedMs = end-start;
var elapsedMinutes = elapsedMs / 1000 / 60;