/**********************************************************************************************
* CountUp script by Praveen Lobo (http://PraveenLobo.com/blog/javascript-countup-timer/)
* This notice MUST stay intact(in both JS file and SCRIPT tag) for legal use. This item of work
* is distributed in the hope that it will be useful, but without any warranty; without even the
* implied warranty of merchantability or fitness for a particular purpose.
* Provided under Creative Commons Attribution-Noncommercial-Share Alike License.
**********************************************************************************************/
function CountUp(initDate, id, msg){
	this.beginDate = new Date(initDate);
	this.msg = msg;
	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.calculate(id);
}

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, 1) - 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.formatTime=function(){
	this.seconds = this.addLeadingZero(this.seconds);
	this.minutes = this.addLeadingZero(this.minutes);
	this.hours = this.addLeadingZero(this.hours);
}

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

CountUp.prototype.calculate=function(id){
	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()-1]);
	this.months = this.datePartDiff(prevDate.getMonth(), currDate.getMonth(), 12);
	this.years = this.datePartDiff(prevDate.getFullYear(), currDate.getFullYear(),0);
	this.formatTime();
	var countainer = document.getElementById(id);
	countainer.innerHTML ="<div class='yr unit'><strong>" + this.years + "</strong> <span>" + (this.years == 1? "year" : "years") + "</span></div>" +
		" <div class='mo unit'><strong>" + this.months + "</strong> <span>" + (this.months == 1? "month" : "months") + "</span></div>" +
		" <div class='day unit'><strong>" + this.days + "</strong> <span>" + (this.days == 1? "day" : "days") + "</span></div>" +
		" <div class='hr unit'><strong>" + this.hours + "</strong> <span>" + (this.hours == 1? "hour" : "hours") + "</span></div>" +
		" <div class='m unit'><strong>" + this.minutes + "</strong> <span>" + (this.minutes == 1? "minute" : "minutes") + "</span></div>" +
		" <div class='s unit'><strong>" + this.seconds + "</strong> <span>" + (this.seconds == 1? "second" : "seconds") + "</span></div>";
	var self = this;
	setTimeout(function(){self.calculate(id);}, 1000);
}