/**
 * Copyright (c)2005-2009 Matt Kruse (javascripttoolbox.com)
 * 
 * Dual licensed under the MIT and GPL licenses. 
 * This basically means you can use this code however you want for
 * free, but don't claim to have written it yourself!
 * Donations always accepted: http://www.JavascriptToolbox.com/donate/
 * 
 * Please do not link to the .js files on javascripttoolbox.com from
 * your site. Copy the files locally to your server instead.
 * 
 */
/*
Date functions

These functions are used to parse, format, and manipulate Date objects.
See documentation and examples at http://www.JavascriptToolbox.com/lib/date/
*/
Date.$VERSION = 1.02;

// Utility function to append a 0 to single-digit numbers
Date.LZ = function(x) {return(x<0||x>9?"":"0")+x};
// Full month names. Change this for local month names
Date.monthNames = new Array('January','February','March','April','May','June','July',
                            'August','September','October','November','Décember');
// Month abbreviations. Change this for local month names
Date.monthAbbreviations = new Array('Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec');
// Full day names. Change this for local month names
Date.dayNames = new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday');
// Day abbreviations. Change this for local month names
Date.dayAbbreviations = new Array('Sun','Mon','Tue','Wed','Thu','Fri','Sat');
// Used for parsing ambiguous dates like 1/2/2000 - default to preferring 'American' format meaning Jan 2.
// Set to false to prefer 'European' format meaning Feb 1
Date.preferAmericanFormat = true;

// Set to 0=SUn for American 1=Mon for european
Date.firstDayOfWeek = 0;

//default 
Date.defaultFormat="dd/MM/yyyy";

// If the getFullYear() method is not defined, create it
if (!Date.prototype.getFullYear) { 
	Date.prototype.getFullYear = function() { var yy=this.getYear(); return (yy<1900?yy+1900:yy); } ;
} 

// Parse a string and convert it to a Date object.
// If no format is passed, try a list of common formats.
// If string cannot be parsed, return null.
// Avoids regular expressions to be more portable.
Date.parseString = function(val, format) {
	// If no format is specified, try a few common formats
	if (typeof(format)=="undefined" || format==null || format=="") {
		var generalFormats=new Array(Date.defaultFormat,'y-M-d','MMM d, y','MMM d,y','y-MMM-d','d-MMM-y','MMM d','MMM-d','d-MMM');
		var monthFirst=new Array('M/d/y','M-d-y','M.d.y','M/d','M-d');
		var dateFirst =new Array('d/M/y','d-M-y','d.M.y','d/M','d-M');
		var checkList=new Array(generalFormats,Date.preferAmericanFormat?monthFirst:dateFirst,Date.preferAmericanFormat?dateFirst:monthFirst);
		for (var i=0; i<checkList.length; i++) {
			var l=checkList[i];
			for (var j=0; j<l.length; j++) {
				var d=Date.parseString(val,l[j]);
				if (d!=null)
					return d;
			}
		}
		return null;
	}

	this.isInteger = function(val) {
		for (var i=0; i < val.length; i++) {
			if ("1234567890".indexOf(val.charAt(i))==-1)
				return false;
		}
		return true;
	};

	this.getInt = function(str,i,minlength,maxlength) {
		for (var x=maxlength; x>=minlength; x--) {
			var token=str.substring(i,i+x);
			if (token.length < minlength) { 
				return null; 
			}
			if (this.isInteger(token)) { 
				return token; 
			}
		}
	return null;
	};

  this.decodeShortcut=function(str){
    var dateUpper = str.trim().toUpperCase();
    var ret=new Date();
    ret.clearTime();

    if (["NOW","N"].indexOf(dateUpper)>=0) {
      ret= new Date();
    } else if (["TODAY","T"].indexOf(dateUpper)>=0) {
      //do nothing
    } else if (["YESTERDAY","Y"].indexOf(dateUpper)>=0) {
      ret.setDate(ret.getDate()-1);
    } else if (["TOMORROW","TO"].indexOf(dateUpper)>=0) {
      ret.setDate(ret.getDate()+1);
    } else if (["W", "TW", "WEEK", "THISWEEK", "WEEKSTART", "THISWEEKSTART"].indexOf(dateUpper)>=0) {
      ret.setDate(ret.getDate()-ret.getDay()+Date.firstDayOfWeek);
    } else if (["LW", "LASTWEEK", "LASTWEEKSTART"].indexOf(dateUpper)>=0) {
      ret.setDate(ret.getDate()-ret.getDay()+Date.firstDayOfWeek-7);
    } else if (["NW", "NEXTWEEK", "NEXTWEEKSTART"].indexOf(dateUpper)>=0) {
      ret.setDate(ret.getDate()-ret.getDay()+Date.firstDayOfWeek+7);
    } else if (["M", "TM", "MONTH", "THISMONTH", "MONTHSTART", "THISMONTHSTART"].indexOf(dateUpper)>=0) {
      ret.setDate(1);
    } else if (["LM", "LASTMONTH", "LASTMONTHSTART"].indexOf(dateUpper)>=0) {
      ret.setDate(1);
      ret.setMonth(ret.getMonth()-1);
    } else if (["NM", "NEXTMONTH", "NEXTMONTHSTART"].indexOf(dateUpper)>=0) {
      ret.setDate(1);
      ret.setMonth(ret.getMonth()+1);
    } else if (["Q", "TQ", "QUARTER", "THISQUARTER", "QUARTERSTART", "THISQUARTERSTART"].indexOf(dateUpper)>=0) {
      ret.setDate(1);
      ret.setMonth(Math.floor((ret.getMonth()) / 3) * 3);
    } else if (["LQ", "LASTQUARTER", "LASTQUARTERSTART"].indexOf(dateUpper)>=0) {
      ret.setDate(1);
      ret.setMonth(Math.floor((ret.getMonth()) / 3) * 3-3);
    } else if (["NQ", "NEXTQUARTER", "NEXTQUARTERSTART"].indexOf(dateUpper)>=0) {
      ret.setDate(1);
      ret.setMonth(Math.floor((ret.getMonth()) / 3) * 3+3);
    } else if (/^-?[0-9]+[DWMY]$/.test(dateUpper)) {
      var lastOne = dateUpper.substr(dateUpper.length - 1);
      var val = parseInt(dateUpper.substr(0, dateUpper.length - 1));
      if (lastOne=="W")
        ret.setDate(ret.getDate()+val*7 );
      else if (lastOne=="M")
        ret.setMonth(ret.getMonth()+val );
      else if (lastOne=="Y")
        ret.setYear(ret.getYear()+val );
    } else {
      ret=undefined;
    }

    return ret;
  };

  var ret=this.decodeShortcut(val);
  if (ret)
    return ret;

	val=val+"";
	format=format+"";
	var i_val=0;
	var i_format=0;
	var c="";
	var token="";
	var token2="";
	var x,y;
	var year=new Date().getFullYear();
	var month=1;
	var date=1;
	var hh=0;
	var mm=0;
	var ss=0;
	var ampm="";
	while (i_format < format.length) {
		// Get next token from format string
		c=format.charAt(i_format);
		token="";
		while ((format.charAt(i_format)==c) && (i_format < format.length)) {
			token += format.charAt(i_format++);
		}
		// Extract contents of value based on format token
		if (token=="yyyy" || token=="yy" || token=="y") {
			if (token=="yyyy")
				x=4;y=4; 

			if (token=="yy")
				x=2;y=2; 

			if (token=="y")
				x=2;y=4; 

			year=this.getInt(val,i_val,x,y);
			if (year==null)
				return null; 

			i_val += year.length;
			if (year.length==2) {
				if (year > 70)
					year=1900+(year-0); 
				else
					year=2000+(year-0); 
			}

		} else if (token=="MMM" || token=="MMMM"){
			month=0;
			var names = (token=="MMMM"?(Date.monthNames.concat(Date.monthAbbreviations)):Date.monthAbbreviations);
			for (var i=0; i<names.length; i++) {
				var month_name=names[i];
				if (val.substring(i_val,i_val+month_name.length).toLowerCase()==month_name.toLowerCase()) {
					month=(i%12)+1;
					i_val += month_name.length;
					break;
				}
			}
			if ((month < 1)||(month>12))
				return null;
		}
		else if (token=="E"||token=="EE"||token=="EEE"||token=="EEEE"){
			var names = (token=="EEEE"?Date.dayNames:Date.dayAbbreviations);
			for (var i=0; i<names.length; i++) {
				var day_name=names[i];
				if (val.substring(i_val,i_val+day_name.length).toLowerCase()==day_name.toLowerCase()) {
					i_val += day_name.length;
					break;
				}
			}

		} else if (token=="MM"||token=="M") {
			month=this.getInt(val,i_val,token.length,2);
			if(month==null||(month<1)||(month>12))
				return null;
			i_val+=month.length;

    } else if (token=="dd"||token=="d") {
			date=this.getInt(val,i_val,token.length,2);
			if(date==null||(date<1)||(date>31))
				return null;
			i_val+=date.length;

    } else if (token=="hh"||token=="h") {
			hh=this.getInt(val,i_val,token.length,2);
			if(hh==null||(hh<1)||(hh>12))
				return null;
			i_val+=hh.length;

    } else if (token=="HH"||token=="H") {
			hh=this.getInt(val,i_val,token.length,2);
			if(hh==null||(hh<0)||(hh>23))
				return null;
			i_val+=hh.length;

		} else if (token=="KK"||token=="K") {
			hh=this.getInt(val,i_val,token.length,2);
			if(hh==null||(hh<0)||(hh>11))
				return null;
			i_val+=hh.length;
			hh++;

    } else if (token=="kk"||token=="k") {
			hh=this.getInt(val,i_val,token.length,2);
			if(hh==null||(hh<1)||(hh>24))
				return null;
			i_val+=hh.length;
			hh--;

    } else if (token=="mm"||token=="m") {
			mm=this.getInt(val,i_val,token.length,2);
			if(mm==null||(mm<0)||(mm>59))
				return null;
			i_val+=mm.length;

    } else if (token=="ss"||token=="s") {
			ss=this.getInt(val,i_val,token.length,2);
			if(ss==null||(ss<0)||(ss>59))
				return null;
			i_val+=ss.length;

    } else if (token=="a") {
			if (val.substring(i_val,i_val+2).toLowerCase()=="am")
				ampm="AM";
			else if (val.substring(i_val,i_val+2).toLowerCase()=="pm")
				ampm="PM";
			else
				return null;
			i_val+=2;

    } else {
			if (val.substring(i_val,i_val+token.length)!=token)
				return null;
			else
				i_val+=token.length;
		}
	}

	// If there are any trailing characters left in the value, it doesn't match
	if (i_val != val.length)
		return null; 

	// Is date valid for month?
	if (month==2) {
		// Check for leap year
		if ( ( (year%4==0)&&(year%100 != 0) ) || (year%400==0) ) { // leap year
			if (date > 29)
				return null; 
		} else {
			if (date > 28)
				return null;
		}
	}

	if ((month==4)||(month==6)||(month==9)||(month==11)) {
		if (date > 30)
			return null;
	}

	// Correct hours value
	if (hh<12 && ampm=="PM")
		hh=hh-0+12;
  else if (hh>11 && ampm=="AM")
		hh-=12;

	return new Date(year,month-1,date,hh,mm,ss);
};

// Check if a date string is valid
Date.isValid = function(val,format) {
	return (Date.parseString(val,format) != null);
};

// Check if a date object is before another date object
Date.prototype.isBefore = function(date2) {
	if (date2==null)
		return false;
	return (this.getTime()<date2.getTime());
};

// Check if a date object is after another date object
Date.prototype.isAfter = function(date2) {
	if (date2==null)
		return false;
	return (this.getTime()>date2.getTime());
};

// Check if two date objects have equal dates and times
Date.prototype.equals = function(date2) {
	if (date2==null)
		return false;
	return (this.getTime()==date2.getTime());
};

// Check if two date objects have equal dates, disregarding times
Date.prototype.equalsIgnoreTime = function(date2) {
	if (date2==null)
		return false;
	var d1 = new Date(this.getTime()).clearTime();
	var d2 = new Date(date2.getTime()).clearTime();
	return (d1.getTime()==d2.getTime());
};

// Format a date into a string using a given format string
Date.prototype.format = function(format) {
  if (!format)
    format=Date.defaultFormat;
	format=format+"";
	var result="";
	var i_format=0;
	var c="";
	var token="";
	var y=this.getYear()+"";
	var M=this.getMonth()+1;
	var d=this.getDate();
	var E=this.getDay();
	var H=this.getHours();
	var m=this.getMinutes();
	var s=this.getSeconds();
	// Convert real date parts into formatted versions
	var value=new Object();
	if (y.length < 4) {
		y=""+(+y+1900);
	}
	value["y"]=""+y;
	value["yyyy"]=y;
	value["yy"]=y.substring(2,4);
	value["M"]=M;
	value["MM"]=Date.LZ(M);
  value["MMM"]=Date.monthAbbreviations[M-1];
  value["MMMM"]=Date.monthNames[M-1];
	value["d"]=d;
	value["dd"]=Date.LZ(d);
	value["E"]=Date.dayAbbreviations[E];
	value["EE"]=Date.dayAbbreviations[E];
	value["EEE"]=Date.dayAbbreviations[E];
	value["EEEE"]=Date.dayNames[E];
	value["H"]=H;
	value["HH"]=Date.LZ(H);

	if (H==0)
		value["h"]=12;
	else if (H>12)
		value["h"]=H-12;
	else
		value["h"]=H;

	value["hh"]=Date.LZ(value["h"]);
	value["K"]=value["h"]-1;
	value["k"]=value["H"]+1;
	value["KK"]=Date.LZ(value["K"]);
	value["kk"]=Date.LZ(value["k"]);
	if (H > 11)
		value["a"]="PM"; 
	else
		value["a"]="AM";

	value["m"]=m;
	value["mm"]=Date.LZ(m);
	value["s"]=s;
	value["ss"]=Date.LZ(s);
	while (i_format < format.length) {
		c=format.charAt(i_format);
		token="";
		while ((format.charAt(i_format)==c) && (i_format < format.length))
			token += format.charAt(i_format++);

		if (typeof(value[token])!="undefined")
			result=result + value[token]; 
		else
			result=result + token; 
	}
	return result;
};

// Get the full name of the day for a date
Date.prototype.getDayName = function() { 
	return Date.dayNames[this.getDay()];
};

// Get the abbreviation of the day for a date
Date.prototype.getDayAbbreviation = function() { 
	return Date.dayAbbreviations[this.getDay()];
};

// Get the full name of the month for a date
Date.prototype.getMonthName = function() {
	return Date.monthNames[this.getMonth()];
};

// Get the abbreviation of the month for a date
Date.prototype.getMonthAbbreviation = function() { 
	return Date.monthAbbreviations[this.getMonth()];
};

// Clear all time information in a date object
Date.prototype.clearTime = function() {
  this.setHours(0); 
  this.setMinutes(0);
  this.setSeconds(0); 
  this.setMilliseconds(0);
  return this;
};

// Add an amount of time to a date. Negative numbers can be passed to subtract time.
Date.prototype.add = function(interval, number) {
	if (typeof(interval)=="undefined" || interval==null || typeof(number)=="undefined" || number==null)
		return this; 

	number = +number;
	if (interval=='y')  // year
		this.setFullYear(this.getFullYear()+number);
	else if (interval=='M')  // Month
		this.setMonth(this.getMonth()+number);
	else if (interval=='d')  // Day
		this.setDate(this.getDate()+number);
	else if (interval=='w') { // Weekday
		var step = (number>0)?1:-1;
		while (number!=0) {
			this.add('d',step);
			while(this.getDay()==0 || this.getDay()==6)
				this.add('d',step);
			number -= step;
		}

  } else if (interval=='h')  // Hour
		this.setHours(this.getHours() + number);
	else if (interval=='m')  // Minute
		this.setMinutes(this.getMinutes() + number);
	else if (interval=='s')  // Second
		this.setSeconds(this.getSeconds() + number);

	return this;
};

Date.prototype.toInt = function () {
	return this.getFullYear()*10000+(this.getMonth()+1)*100+this.getDate();
};