// These functions use the same 'format' strings as the 
// java.text.SimpleDateFormat class, with minor exceptions.
// The format string consists of the following abbreviations:
// 
// Field        | Full Form          | Short Form
// -------------+--------------------+-----------------------
// Year         | yyyy (4 digits)    | yy (2 digits), y (2 or 4 digits)
// Month        | MMM (name or abbr.)| MM (2 digits), M (1 or 2 digits)
//              | NNN (abbr.)        |
// Day of Month | dd (2 digits)      | d (1 or 2 digits)
// Day of Week  | EE (name)          | E (abbr)
// Hour (1-12)  | hh (2 digits)      | h (1 or 2 digits)
// Hour (0-23)  | HH (2 digits)      | H (1 or 2 digits)
// Hour (0-11)  | KK (2 digits)      | K (1 or 2 digits)
// Hour (1-24)  | kk (2 digits)      | k (1 or 2 digits)
// Minute       | mm (2 digits)      | m (1 or 2 digits)
// Second       | ss (2 digits)      | s (1 or 2 digits)
// AM/PM        | a                  |
//
// NOTE THE DIFFERENCE BETWEEN MM and mm! Month=MM, not mm!
// Examples:
//  "MMM d, y" matches: January 01, 2000
//                      Dec 1, 1900
//                      Nov 20, 00
//  "M/d/yy"   matches: 01/20/00
//                      9/2/00
//  "MMM dd, yyyy hh:mm:ssa" matches: "January 01, 2000 12:30:45AM"
// ------------------------------------------------------------------

var MONTH_NAMES = new Array('January','February','March','April','May','June','July','August','September','October','November','December','Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec');
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
}

// ------------------------------------------------------------------
// isDate ( date_string, format_string )
// Returns true if date string matches format of format string and
// is a valid date. Else returns false.
// It is recommended that you trim whitespace around the value before
// passing it to this function, as whitespace is NOT ignored!
// ------------------------------------------------------------------

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

// -------------------------------------------------------------------
// compareDates(date1,date1format,date2,date2format)
//   Compare two date strings to see which is greater.
//   Returns:
//   1 if date1 is greater than date2
//   0 if date2 is greater than date1 of if they are the same
//  -1 if either of the dates is in an invalid format
// -------------------------------------------------------------------

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

// ------------------------------------------------------------------
// formatDate (date_object, format)
// Returns a date in the output format specified.
// The format string uses the same abbreviations as in getDateFromFormat()
// ------------------------------------------------------------------

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;

	// Convert real date parts into formatted versions

	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);
	
	if (H == 0) {
		value["h"] = 12;
	} else if (H > 12) {
		value["h"] = H-12;
	} else {
		value["h"] = H;
	}
	
	value["hh"] = LZ(value["h"]);
	
	if (H > 11) {
		value["K"] = H-12;
	} else {
		value["K"] = H;
	}
	
	value["k"] = H+1;
	value["KK"] = LZ(value["K"]);
	value["kk"] = LZ(value["k"]);
	
	if (H > 11) { 
		value["a"] = "PM"; 
	} else { 
		value["a"] = "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++);
			}
		if (value[token] != null) { 
			result = result + value[token]; 
		} else { 
			result = result + token; 
		}
	}
	return result;
}
	
// ------------------------------------------------------------------
// Utility functions for parsing in getDateFromFormat()
// ------------------------------------------------------------------

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;
}
	
// ------------------------------------------------------------------
// getDateFromFormat( date_string , format_string )
//
// This function takes a date string and a format string. It matches
// If the date string matches the format string, it returns the 
// getTime() of the date. If it does not match, it returns 0.
// ------------------------------------------------------------------

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) {
		// 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 = _getInt(val,i_val,x,y);
			if (year == null) { return 0; }
			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 == "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 there are any trailing characters left in the value, it doesn't match
	if (i_val != val.length) { return 0; }
	// 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 0; }
			}
		else { if (date > 28) { return 0; } }
		}
	if ((month == 4) || (month == 6) || (month == 9) || (month == 11)) {
		if (date > 30) { return 0; }
		}
	// Correct hours value
	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();
	}

// ------------------------------------------------------------------
// parseDate( date_string [, prefer_euro_format] )
//
// This function takes a date string and tries to match it to a
// number of possible date formats to get the value. It will try to
// match against the following international formats, in this order:
// y-M-d   MMM d, y   MMM d,y   y-MMM-d   d-MMM-y  MMM d
// M/d/y   M-d-y      M.d.y     MMM-d     M/d      M-d
// d/M/y   d-M-y      d.M.y     d-MMM     d/M      d-M
// A second argument may be passed to instruct the method to search
// for formats like d/M/y (european format) before M/d/y (American).
// Returns a Date object or null if no patterns match.
// ------------------------------------------------------------------

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');
	var checkList = new Array('generalFormats',preferEuro?'dateFirst':'monthFirst',preferEuro?'monthFirst':'dateFirst');
	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;
}


function findDifference(yr,m,d) {

	var today = new Date();
	var thisYr = today.getYear();

	if (thisYr < 1000) {
		thisYr += 1900;
	}
	
	var thisMth = today.getMonth();
	var thisDt = today.getDate();
	var todaystring = MONTH_NAMES[thisMth-1] + " " + thisDt + ", " + thisYr;
	var paststring = MONTH_NAMES[m-1] + " " + d + ", " + yr;
	var difference = (Math.round((Date.parse(todaystring)-Date.parse(paststring))/(24*60*60*1000))*1);

}

//enter the count up date using the format year/month/day
//countup(1997,12,05)