Time Between Two Dates

timeBetweenDates.js

/* Returns time string between two dates in days, hours, minutes, and seconds */
var timeBetweenTwoDates = function(date1, date2) {
  var seconds = Math.round((todaysDate - updateDate)/1000); //seconds
  return calculateTime(seconds);
};

var calculateTime = function(seconds) {
  var seconds = seconds || 0
    , minutes = 0
    , hours = 0
    , days = 0;

  if (seconds > 59) {
    minutes = Math.floor(seconds / 60); // minutes
    seconds = Math.floor(((seconds / 60) % 1) * 60);
    if (minutes > 59) {
      hours = Math.floor(minutes / 60); // hours
      minutes = Math.floor(((minutes / 60) % 1) * 60);
      if (hours > 23) {
        days = Math.floor(hours / 24); // days
        hours = Math.floor(((hours / 24) % 1) * 24);
      }
    }
  } else {
    seconds = Math.floor(seconds);
  }
  return ((days) ? days + " days " : "") + ((hours) ? hours + " hours " : "") + ((minutes) ? minutes + " minutes " : "") + seconds + " seconds";
}