/*
basic functions for date manage
last-update: 2005/03/10
by: myers

Author: Matt Kruse <matt@mattkruse.com>
WWW: http://www.mattkruse.com/
*/
var MONTH_NAMES=new Array('Janeiro','Fevereiro','Março','Abril','Maio','Junho','Julho','Agosto','Setembro','Outubro','Novembro','Dezembro','Jan','Fev','Mar','Abr','Mai','Jun','Jul','Ago','Set','Out','Nov','Dez');
var DAY_NAMES=new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sun','Mon','Tue','Wed','Thu','Fri','Sat');
function LZ(x) {return(x<0||x>9?"":"0")+x}

function isDate(val,format) {
	var date=getDateFromFormat(val,format);
	return (date==0)?false:true;
}

function compareDates(date1,dateformat1,date2,dateformat2) {
	var d1=getDateFromFormat(date1,dateformat1);
	var d2=getDateFromFormat(date2,dateformat2);
	return (d1==0||d2==0)?-1:(d2>d1)?1:0;
}

function formatDate(date,format) {
	format=format+"";
	var result="";
	var i_format=0;
	var c="";
	var token="";
	var y=date.getYear()+"";
	var M=date.getMonth()+1;
	var d=date.getDate();
	var E=date.getDay();
	var H=date.getHours();
	var m=date.getMinutes();
	var s=date.getSeconds();
	var yyyy,yy,MMM,MM,dd,hh,h,mm,ss,ampm,HH,H,KK,K,kk,k;
	
	var value=new Object();
	if (y.length < 4)y=""+(y-0+1900);
	value["y"]=""+y;
	value["yyyy"]=y;
	value["yy"]=y.substring(2,4);
	value["M"]=M;
	value["MM"]=LZ(M);
	value["MMM"]=MONTH_NAMES[M-1];
	value["NNN"]=MONTH_NAMES[M+11];
	value["d"]=d;
	value["dd"]=LZ(d);
	value["E"]=DAY_NAMES[E+7];
	value["EE"]=DAY_NAMES[E];
	value["H"]=H;
	value["HH"]=LZ(H);
	value["h"]=(H==0)?12:(H>12)?H-12:H;
	value["hh"]=LZ(value["h"]);
	value["K"]=(H>11)?H-12:H;
	value["k"]=H+1;
	value["KK"]=LZ(value["K"]);
	value["kk"]=LZ(value["k"]);
	value["a"]=(H > 11)?"PM":"AM";
	value["m"]=m;
	value["mm"]=LZ(m);
	value["s"]=s;
	value["ss"]=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++);
		result = (value[token] != null)?result + value[token]:result + token;
		}
	return result;
	}

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

function _getInt(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(_isInteger(token))return token;
	}
	return null;
}
	
function getDateFromFormat(val,format) {
	val=val+"";
	format=format+"";
	var i_val=0;
	var i_format=0;
	var c="";
	var token="";
	var token2="";
	var x,y;
	var now=new Date();
	var year=now.getYear();
	var month=now.getMonth()+1;
	var date=1;
	var hh=now.getHours();
	var mm=now.getMinutes();
	var ss=now.getSeconds();
	var ampm="";

	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 (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=_getInt(val,i_val,x,y);
			if (year==null)return 0;
			i_val += year.length;
			if (year.length==2)year=(year > 70)?1900+(year-0):2000+(year-0);
		}else if (token=="MMM"||token=="NNN"){
			month=0;
			for (var i=0; i<MONTH_NAMES.length; i++) {
				var month_name=MONTH_NAMES[i];
				if (val.substring(i_val,i_val+month_name.length).toLowerCase()==month_name.toLowerCase()) {
					if (token=="MMM"||(token=="NNN"&&i>11)) {
						month=i+1;
						if (month>12)month -= 12;
						i_val += month_name.length;
						break;
					}
				}
			}
			if ((month < 1)||(month>12))return 0;
		}else if (token=="EE"||token=="E"){
			for (var i=0; i<DAY_NAMES.length; i++) {
				var day_name=DAY_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=_getInt(val,i_val,token.length,2);
			if(month==null||(month<1)||(month>12))return 0;
			i_val+=month.length;
		}else if (token=="dd"||token=="d"){
			date=_getInt(val,i_val,token.length,2);
			if(date==null||(date<1)||(date>31))return 0;
			i_val+=date.length;
		}else if (token=="hh"||token=="h"){
			hh=_getInt(val,i_val,token.length,2);
			if(hh==null||(hh<1)||(hh>12))return 0;
			i_val+=hh.length;
		}else if (token=="HH"||token=="H"){
			hh=_getInt(val,i_val,token.length,2);
			if(hh==null||(hh<0)||(hh>23))return 0;
			i_val+=hh.length;
		}else if (token=="KK"||token=="K"){
			hh=_getInt(val,i_val,token.length,2);
			if(hh==null||(hh<0)||(hh>11))return 0;
			i_val+=hh.length;
		}else if (token=="kk"||token=="k"){
			hh=_getInt(val,i_val,token.length,2);
			if(hh==null||(hh<1)||(hh>24))return 0;
			i_val+=hh.length;hh--;
		}else if (token=="mm"||token=="m"){
			mm=_getInt(val,i_val,token.length,2);
			if(mm==null||(mm<0)||(mm>59))return 0;
			i_val+=mm.length;
		}else if (token=="ss"||token=="s"){
			ss=_getInt(val,i_val,token.length,2);
			if(ss==null||(ss<0)||(ss>59))return 0;
			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 0;
			i_val+=2;
		}else {
			if(val.substring(i_val,i_val+token.length)!=token)return 0;
			else i_val+=token.length;
		}
	}
	if(i_val != val.length)return 0;
	if(month==2){
		if(isLeapYear(year))if(date > 29)return 0;
		else if(date > 28)return 0;
	}
	if((month==4)||(month==6)||(month==9)||(month==11))if (date > 30)return 0;
	if(hh<12 && ampm=="PM")hh=hh-0+12;
	else if (hh>11 && ampm=="AM")hh-=12;
	var newdate=new Date(year,month-1,date,hh,mm,ss);
	return newdate.getTime();
}

function parseDate(val) {
	var preferEuro=(arguments.length==2)?arguments[1]:false;
	generalFormats=new Array('y-M-d','MMM d, y','MMM d,y','y-MMM-d','d-MMM-y','MMM d');
	monthFirst=new Array('M/d/y','M-d-y','M.d.y','MMM-d','M/d','M-d');
	dateFirst =new Array('d/M/y','d-M-y','d.M.y','d-MMM','d/M','d-M');
	yearFirst =new Array('y/M/d','y-M-d','yMd');
	var checkList=new Array('generalFormats',preferEuro?'dateFirst':'monthFirst',preferEuro?'monthFirst':'dateFirst',yearFirst);
	var d=null;
	for (var i=0; i<checkList.length; i++) {
		var l=window[checkList[i]];
		for (var j=0; j<l.length; j++) {
			d=getDateFromFormat(val,l[j]);
			if (d!=0)return new Date(d);
		}
	}
	return null;
}