Dates, time, difference , diff
var date1 = new Date("2015-12-01 15:20:00");
var date2 = new Date("2015-12-01 16:20:00");
var timeDiff = Math.abs(date2.getTime() - date1.getTime());
//var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));
var diffInMinutes = Math.ceil(timeDiff / (1000 * 60));
//var diffSeconds = Math.ceil(timeDiff / 1000);
var realmin = minutes % 60
var hours = Math.floor(minutes / 60)