function oc(a)
{
  var o = {};
  for(var i=0;i<a.length;i++)
  {
    o[a[i]]='';
  }
  return o;
}
function CountUp(initDate, id){
    this.beginDate = new Date(initDate);
    this.countainer = document.getElementById(id);
    this.numOfDays = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ];
    this.borrowed = 0, this.years = 0, this.months = 0, this.days = 0;
    this.hours = 0, this.minutes = 0, this.seconds = 0;
    this.updateNumOfDays();
    this.updateCounter();
}

CountUp.prototype.updateNumOfDays=function(){
    var dateNow = new Date();
    var currYear = dateNow.getFullYear();
    if ( (currYear % 4 == 0 && currYear % 100 != 0 ) || currYear % 400 == 0 ) {
        this.numOfDays[1] = 29;
    }
    var self = this;
    setTimeout(function(){self.updateNumOfDays();}, (new Date((currYear+1), 1, 2) - dateNow));
}

CountUp.prototype.datePartDiff=function(then, now, MAX){
    var diff = now - then - this.borrowed;
    this.borrowed = 0;
    if ( diff > -1 ) return diff;
    this.borrowed = 1;
    return (MAX + diff);
}

CountUp.prototype.calculate=function(){
    var currDate = new Date();
    var prevDate = this.beginDate;
    this.seconds = this.datePartDiff(prevDate.getSeconds(), currDate.getSeconds(), 60);
    this.minutes = this.datePartDiff(prevDate.getMinutes(), currDate.getMinutes(), 60);
    this.hours = this.datePartDiff(prevDate.getHours(), currDate.getHours(), 24);
    this.days = this.datePartDiff(prevDate.getDate(), currDate.getDate(), this.numOfDays[currDate.getMonth()]);
    this.months = this.datePartDiff(prevDate.getMonth(), currDate.getMonth(), 12);
    this.years = this.datePartDiff(prevDate.getFullYear(), currDate.getFullYear(),0);
}

CountUp.prototype.addLeadingZero=function(value){
    return value < 10 ? ("0" + value) : value;
}

CountUp.prototype.formatTime=function(){
    this.months = this.addLeadingZero(this.months);
    this.days = this.addLeadingZero(this.days);
    this.seconds = this.addLeadingZero(this.seconds);
    this.minutes = this.addLeadingZero(this.minutes);
    this.hours = this.addLeadingZero(this.hours);
}

CountUp.prototype.updateCounter=function(){
    this.calculate();
    this.formatTime();
    this.countainer.innerHTML ="<div id=\"year_c\"><span>" + this.years  + "</span></div>" +
        "<div id=\"month_c\"><span>" + this.months  + "</span></div>" +
        "<div id=\"day_c\"><span>" + this.days + "</span></div>" +
        "<div id=\"hour_c\"><span>" + this.hours + "</span></div>" +
        "<div id=\"minute_c\"><span>" + this.minutes + "</span></div>";

    var self = this;
    setTimeout(function(){self.updateCounter();}, 1000);
}

window.onload=function(){ new CountUp('July 1, 1999 19:00:00', 'counter'); }