/**
* Class that handles Date and Time related operations.
* It is very similar to .NET's DateTime class
* Find reference and documentation at: http://menendezpoo.com
*/

//Constructor
function DateTime(){
	var year = 0;
	var month = 0;
	var day = 0;
	var hour = 0;
	var minute = 0;
	var second = 0;
	var millisecond = 0;
	
	switch(arguments.length){
		case 0:
			var d = new Date();
			year = d.getFullYear();
			month = d.getMonth() + 1;
			day = d.getDay();
			hour = d.getHours();
			minute = d.getMinutes();
			second = d.getSeconds();
			millisecond = d.getMilliseconds();
			break;
		case 1:
			millisecond = arguments[0];
			break;
		case 3:
			year = arguments[0];
			month = arguments[1];
			day = arguments[2];
			break;
		case 6:
			year = arguments[0];
			month = arguments[1];
			day = arguments[2];
			hour = arguments[3];
			minute = arguments[4];
			second = arguments[5];
			break;
		case 7:
			year = arguments[0];
			month = arguments[1];
			day = arguments[2];
			hour = arguments[3];
			minute = arguments[4];
			second = arguments[5];
			millisecond = arguments[6];
			break;
		default:
			throw("No constructor supports " + arguments.length + " arguments");
	}
	
	if(!year && !month && !day)
		days = 0;
	else
		days = Math.round(this.absoluteDays(year, month, day));
	
	this.span = new TimeSpan(days, hour, minute, second, millisecond);
 	
};

DateTime.prototype = {
	
		toString : function(){
			return this.year() + "/" + TimeSpan.pad(this.month()) + "/" + TimeSpan.pad(this.day()) +  " " + this.timeOfDay();
		},
				
		/* Methods */
		absoluteDays : function(year, month, day){
			
			function div(a,b){ return Math.round(a/b); }
			var num = 0;
			var num2= 1;
			var numArray = !DateTime.isLeapYear(year) ? DateTime.monthDays : DateTime.monthDaysLeapYear;
			while(num2 < month){
				num += numArray[num2++];
			}
			return ((((((day - 1) + num) + (365 * (year - 1))) + ((year -1 ) / 4)) - (( year - 1) / 100)) + ((year - 1) / 400));s
		},
		
		add : function(timespan){
			return new DateTime(this.span._millis + timespan._millis);
		},
		
		addDays : function(days){
			return new DateTime(this.span._millis + days * 86400000);
		},
		
		addHours : function(hours){
			return new DateTime(this.span._millis + hours * 3600000);
		},
		
		addMilliseconds : function(millis){
			return new DateTime(this.span._millis + millis);
		},
		
		addMinutes : function(minutes){
			return new DateTime(this.span._millis + minutes * 60000);
		},
		
		addMonths : function(months){
			var day = this.day();
			var month = this.month() + (months % 12);
			var year = this.year() + Math.round(months / 12);
			
			if(month < 1){
				month = 12 + month;
			}else if(month > 12){
				month -=12;
				year++;
			}
			
			var days = DateTime.daysInMonth(year, month);
			
			if(day > days)
				day = days;
				
			var time = new DateTime(year, month, day);
			return time.add(this.timeOfDay());
		},
		
		addSeconds : function(seconds){
			return new DateTime(this.span._millis + seconds * 1000);
		},
		
		addYears : function(years){
			return this.addMonths(years * 12);
		},
		
		compareTo : function(datetime){
			return this.span.compareTo(datetime.span);
		},
		
		equals : function(datetime){
			return this.span.equals(datetime.span);
		},
		
		subtractDate : function(datetime){
			return new TimeSpan(this.span._millis - datetime.span._millis);
		},
		
		subtractTime : function(timespan){
			return new DateTime(this.span._millis - timespan._millis);
		},
		
		fromSpan : function(what){
			
			var index = 1;
			var daysmonth = DateTime.monthDays;
			var days = this.span.days();
			var num = Math.round(days / 146097);
			days -= num * 146097;
			var num2 = Math.round(days / 36524);
			if(num2 == 4) num2 =3;
			days -= num2 * 36524;
			var num3 = Math.round(days / 1461);
			days -= num3 * 1461;
			var num4 = Math.round(days / 365);
			if(num4 == 4) num = 3;
			if(what == "year")
				return (((((num * 400) + (num2 * 100)) + (num3 * 4)) + num4) + 1);
			days -= num4 * 365;
			if(what != "dayyear"){
				if((num4==3) && ((num2 == 3) || (num3 != 24)))
					daysmonth = DateTime.monthDaysLeapYear;
				while(days >= daysmonth[index])
					days -= daysmonth[index++];
				if(what == "month")
					return index;
			}
			return days + 1;
			
		},
		
		
		format : function (format){
			var shortdays = new Array("", DateTime.strings.Mon, DateTime.strings.Tue, DateTime.strings.Wed, DateTime.strings.Thu, DateTime.strings.Fri, DateTime.strings.Sat, DateTime.strings.Sun);
			var days = new Array("", DateTime.strings.Monday, DateTime.strings.Tuesday, DateTime.strings.Wednesday, DateTime.strings.Thursday, DateTime.strings.Friday, DateTime.strings.Saturday, DateTime.strings.Sunday);
			var shortmonths = new Array("", DateTime.strings.Jan, DateTime.strings.Feb, DateTime.strings.Mar, DateTime.strings.Apr, DateTime.strings.May, DateTime.strings.Jun, DateTime.strings.Jul, DateTime.strings.Aug, DateTime.strings.Sep, DateTime.strings.Oct, DateTime.strings.Nov, DateTime.strings.Dec);
			var months      = new Array("", DateTime.strings.January, DateTime.strings.February, DateTime.strings.March, DateTime.strings.April, DateTime.strings.MayFull, DateTime.strings.June, DateTime.strings.July, DateTime.strings.August, DateTime.strings.September, DateTime.strings.October, DateTime.strings.November, DateTime.strings.December);
			
			var day = this.day();
			var dayOfWeek = this.dayOfWeek();
			var millisecond = this.millisecond();
			var hour = this.hour();
			var minute = this.minute();
			var second = this.second();
			var month = this.month();
			var year = this.year();
			
			var data = new Array();
			
			var yearstr = year + "";
			/*
			if(yearstr.length > 1)
				yearstr = yearstr.substr(0, yearstr.length - 2)
			*/
			data["dddd"] = days[dayOfWeek];
			data["ddd"]  = shortdays[dayOfWeek];
			data["dd"] = TimeSpan.pad(day);
			data["d"] = day;
			data["fff"] = millisecond;
			data["ff"] = Math.round(millisecond / 10);
			data["f"] = Math.round(millisecond / 100);
			data["hh"] = TimeSpan.pad(hour > 12 ? hour - 12 : hour);
			data["h"] = hour > 12 ? hour - 12 : hour;
			data["HH"] = TimeSpan.pad(hour);
			data["H"] = hour;
			data["mm"] = TimeSpan.pad(minute);
			data["m"] = minute;
			data["MMMM"] = months[month];
			data["MMM"] = shortmonths[month];
			data["MM"] = TimeSpan.pad(month);
			data["M"] = month;
			data["ss"] = TimeSpan.pad(second);
			data["s"] = second;
			data["tt"] = (hour > 12 ? DateTime.strings.PM : DateTime.strings.AM) ;
			data["t"] = (hour > 12 ? DateTime.strings.P : DateTime.strings.A);
			data["yyyy"] = year;
			data["yyy"] = year;
			data["yy"] = year;
			data["y"] = year;
			data[":"] = DateTime.strings.TimeSeparator;
			data["/"] = DateTime.strings.DateSeparator;
			
			
			var output = "";
			var res = format.split(/(dddd|ddd|dd|d|fff|ff|f|hh|h|HH|H||mm|m|MMMM|MMM|MM|M|ss|s|tt|t|yyyy|yyy|yy|y)?/);
			
			for(var i = 0; i < res.length; i++){
				if(res[i]){
					if(data[res[i]]){
						output += data[res[i]];
					}else{
						output += res[i];
					}
				}
			}
			
			return output;
		},
		
		/* Properties */
		date : function(){
			return new DateTime(this.year(), this.month(), this.day());
		},
		
		day : function(){
			return this.fromSpan("day");
		},
		
		dayOfWeek : function(){
			return (this.span.days() + 1) % 7;
		},
		
		dayOfYear : function(){
			return this.fromSpan("dayyear");
		},
		
		hour : function(){
			return this.span.hours();
		},
		
		millisecond : function(){
			return this.span.milliseconds();
		},
		
		minute : function(){
			return this.span.minutes();
		},
		
		month : function(){
			return this.fromSpan("month");
		},
		
		second : function(){
			return this.span.seconds();
		},
		
		timeOfDay : function(){
			return new TimeSpan(this.span._millis % 86400000);
		},
		
		year : function(){
			return this.fromSpan("year");
		}
		
		
		
	}

DateTime.monthDays =         new Array(0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
DateTime.monthDaysLeapYear = new Array(0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
DateTime.daysInMonth = function (year, month){
	if(DateTime.isLeapYear(year)){
		return DateTime.monthDaysLeapYear[month];
	}else{
		return DateTime.monthDays[month];
	}
};
DateTime.now = function(){
	d = new Date();
	return new DateTime(d.getFullYear(), d.getMonth() + 1, d.getDay(), d.getHours(), d.getMinutes(), d.getSeconds(), d.getMilliseconds());
};
DateTime.utcNow = function(){
	d = new Date();
	return new DateTime(d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDay(), d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds(), d.getUTCMilliseconds());
};
DateTime.today = function(){
	var now = DateTime.now();
	return new DateTime(now.year(), now.month(), now.day());
};
DateTime.isLeapYear = function(year){
		if (( (year % 4 == 0) && (year % 100 != 0) ) || (year % 400 == 0))
        	return true;
		return false;
};

///*
DateTime.strings = function(){  };
DateTime.strings.Mon 		= "Mon";
DateTime.strings.Monday 	= "Monday";
DateTime.strings.Tue 		= "Tue";
DateTime.strings.Tuesday 	= "Tuesday";
DateTime.strings.Wed 		= "Wed";
DateTime.strings.Wednesday 	= "Wednesday";
DateTime.strings.Thu 		= "Thu";
DateTime.strings.Thursday 	= "Thursday";
DateTime.strings.Fri 		= "Fri";
DateTime.strings.Friday 	= "Friday";
DateTime.strings.Sat 		= "Sat";
DateTime.strings.Saturday 	= "Saturday";
DateTime.strings.Sun 		= "Sun";
DateTime.strings.Sunday 	= "Sunday";
DateTime.strings.Jan 		= "Jan";
DateTime.strings.Januray 	= "January";
DateTime.strings.Feb 		= "Feb";
DateTime.strings.February	= "February";
DateTime.strings.Mar 		= "Mar";
DateTime.strings.March 		= "March";
DateTime.strings.Apr 		= "Apr";
DateTime.strings.April 		= "April";
DateTime.strings.May 		= "May";
DateTime.strings.MayFull 	= "May";
DateTime.strings.Jun 		= "Jun";
DateTime.strings.June		= "June";
DateTime.strings.Jul 		= "Jul";
DateTime.strings.July		= "July";
DateTime.strings.Aug 		= "Aug";
DateTime.strings.August 	= "August";
DateTime.strings.Sep 		= "Sep";
DateTime.strings.September 	= "September";
DateTime.strings.Oct 		= "Oct";
DateTime.strings.October 	= "October";
DateTime.strings.Nov 		= "Nov";
DateTime.strings.November 	= "November";
DateTime.strings.Dec 		= "Dec";
DateTime.strings.December 	= "December";
DateTime.strings.A  		= "A";
DateTime.strings.AM 		= "AM";
DateTime.strings.P			= "P";
DateTime.strings.PM 		= "PM";
DateTime.strings.TimeSeparator = ":";
DateTime.strings.DateSeparator = "/";



/**
* Class that handles time related operations.
* It is very similar to .NET's TimeSpan class
* Find reference and documentation at: http://menendezpoo.com
*/
function TimeSpan(){
	
	var days = 0;
	var hours = 0;
	var minutes = 0;
	var seconds = 0;
	var milliseconds = 0;
	
	switch(arguments.length){
		case 0:
			break;
		case 1:
			milliseconds = arguments[0];
			break;
		case 2:
			days = arguments[0];
			hours = arguments[1];
			break;
		case 3:
			hours = arguments[0];
			minutes = arguments[1];
			seconds = arguments[2];
			break;
		case 4:
			days = arguments[0];
			hours = arguments[1];
			minutes = arguments[2];
			seconds = arguments[3];
			break;
		case 5:
			days = arguments[0];
			hours = arguments[1];
			minutes = arguments[2];
			seconds = arguments[3];
			milliseconds = arguments[4];
			break;
		default:
			throw("No constructor of TimeSpan supports " + arguments.length + " arguments");
	}

	this._millis = (days * 86400 + hours * 3600 + minutes * 60 + seconds) * 1000 + milliseconds;
	
};

TimeSpan.prototype = {
	/* Methods */
	add : function(timespan){
		return new TimeSpan(timespan._millis + this._millis);
	},
	
	compareTo : function(timespan){
		if(this._millis > timespan._millis) return 1;
		if(this._millis == timespan._millis) return 0;
		if(this._millis < timespan._millis) return -1;
	},
	
	duration : function(){
		return new TimeSpan(Math.abs(this._millis));
	},
	
	equals : function(timespan){
		return this._millis == timespan._millis;
	},
	
	negate : function(){ 
		this._millis *= -1; 
	},
	
	subtract : function(timespan){
		return new TimeSpan(this._millis - timespan._millis);
	},
	
	rounder : function(number){
		if(this._millis < 0)
			return Math.ceil(number);
		return Math.floor(number);
	},
	
	/* Properties */
	
	days : function(){ 
		return this.rounder(this._millis / (24 * 3600 * 1000) ); 
	},
	
	hours : function(){ 
		return this.rounder( (this._millis % (24 * 3600 * 1000)) / (3600 * 1000)); 
	},
	
	milliseconds : function(){ 
		return this.rounder(this._millis % 1000); 
	},
	
	minutes : function(){ 
		return this.rounder( (this._millis % (3600 * 1000)) / (60 * 1000)); 
	},
	
	seconds : function(){ 
		return this.rounder((this._millis % 60000) / 1000); 
	},
	
	totalDays : function(){ 
		return this._millis / (24 * 3600 * 1000); 
	},
	
	totalHours : function(){ 
		return this._millis / (3600 * 1000); 
	},
	
	totalMinutes : function(){ 
		return this._millis / (60 * 1000); 
	},
	
	totalSeconds : function(){ 
		return this._millis / 1000; 
	},
	
	totalMilliseconds : function(){ 
		return this._millis; 
	},
		
	toString : function(){
		return (this._millis < 0 ? "-" : "") + (Math.abs(this.days()) ? TimeSpan.pad(Math.abs(this.days()))  + ".": "") + TimeSpan.pad(Math.abs(this.hours())) + ":" + TimeSpan.pad(Math.abs(this.minutes())) + ":" + TimeSpan.pad(Math.abs(this.seconds())) + "." + Math.abs(this.milliseconds());
	}
};

TimeSpan.pad = function(number){ return (number < 10 ? '0' : '') + number; };