Register-able Clock Object in JS

clock.js

// usage example: where 1 real second = 1 game hour
// says "did it" every game hour, i.e. every real second
/*
var clock = new Clock();
clock.onHourPass({
  name: 'dothat',
  fn: function(args){
    console.log('did it');
  }
});
clock.start();
*/

function Clock(args) {
  var self = this;
  args = args || {};
  self.realSecondsInGameHour = args.gameHour || 1;
  self.gameMinutesInGameHour = args.gameMinutesInGameHour || 4;
  self.gameHoursInGameDay = args.gameHoursInGameDay || 15;
  self.gameDay = self.realSecondsInGameHour * self.gameHoursInGameDay;
  self.hourlyEvents = {};
  self.dailyEvents = {};
  self.interval;
  self._hour;

  this.onHourPass = function(args) {
    self.hourlyEvents[args.name] = args.fn;
  }

  this.onDayPass = function(args) {
    self.dailyEvents[args.name] = args.fn;
  }

  this._triggerHourlyEvents = function(){
    var events = Object.keys(self.hourlyEvents);
    events.forEach(function(e){
      self.hourlyEvents[e](self);
    });
  }

  this._triggerDailyEvents = function(){
    var events = Object.keys(self.dailyEvents);
    events.forEach(function(e){
      self.dailyEvents[e](self);
    });
  }

  this.start = function() {
    self._hour = 0;
    self._minute = 0;
    console.log('clock interval start');
    self.interval = window.setInterval(function(){
      self._minute++;
      self._hour = self._minute / self.gameMinutesInGameHour;

      if(self._minute % self.gameMinutesInGameHour == 0) {
        self._triggerHourlyEvents();
      }

      if(self._hour == self.gameHoursInGameDay) {
        self._triggerDailyEvents();
        self.end();
      }
    }, (self.realSecondsInGameHour/self.gameMinutesInGameHour) * 1000);
  }

  this.end = function() {
    console.log('clock day ended in ' + self._hour + ' hours');
    window.clearInterval(self.interval);
  }
}