// ===================================================================
// Author: Matt Kruse <matt@mattkruse.com>
// WWW: http://www.mattkruse.com/
// ===================================================================

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;
		 }
// ------------------------------------------------------------------
// ------------------------------------------------------------------
// isDateReturn(string to check)
// expects a date separated with /, with a four digit year.
// returns an error message
// ------------------------------------------------------------------
function isDateReturn(inputStr)
	{
	carRet = " \n"
		inputvalue = inputStr.value;
		//check that the value entered is between 8 and 10 chars in length i.e. 1/1/2000 or 01/01/2000
		if(inputvalue.length > 10 | inputvalue.length < 8)
			{
				return("You must enter the date in format dd/mm/yyyy" +carRet);
			}
		//check that the value entered contains the / delimiters
		var delim1 = inputvalue.indexOf("/");
		var delim2 = inputvalue.lastIndexOf("/");
		if(delim1 ==-1 | delim2 == delim1)
		    {
		    	    return("Incorrect delimiters. You must enter the date in format dd/mm/yyyy"+carRet);
		    	}
		// separate out day month and year components. Substring using the delimiter indexes. Nb use the radix option on parseInt to ensure
		//that values are returned in base ten even if the user enters leading zeros.
		var day = parseInt(inputvalue.substring(0,delim1),10);
		var month = parseInt(inputvalue.substring(delim1+1,delim2),10);
		var year = parseInt(inputvalue.substring(delim2+1,inputvalue.length),10);
		
		//check that each date element is a number
		if(isNaN(day) || isNaN(month) || isNaN(year))
		  {
		  	    return("You have used non-numbers in the date.You must enter the date in format dd/mm/yyyy."+carRet);
		   }
		 //check that the numbers in the day and month fields are valid. Check the length of the year element.
		 if(day < 1 || day > 31)
		   {
		   	return("The day must be between 1 and 31"+carRet);
		   }
		 if(month < 1 || month > 12)
		   {
		   	return("The month must be between 1 and 12"+carRet);
		  }
		if(year  < 1000)
		  {
		  	return("The year must be four digits long"+carRet);
		  }
		//check that there are the right number of days specified for the month
		var months = new Array("","January","February","March","April", "May", "June","July","August","September","October","November","December");
		if((month == 4 || month==6 || month==9 || month==11)  && day > 30)
		  {
			return(months[month] + " only has 30 days"+carRet);
		  }
		  //check for leap years and february days.
		if(month == 2)
			{
				if(year % 4 > 0 && day > 28)
					{
						return("February only has 28 days in " + year + carRet);
					}
					else if(day > 29)
						{
							return("February only has 29 days in " + year+carRet);
						}	 
			}
	return("");
	}
//end of function isDateReturn
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// checkDate(friendly name of date field, date field name, error list
// returns full error message for a particular date field
//-----------------------------------------------------------------------------
function checkDate(DateFriendly, DateFieldName, ErrListX) {
	/* checkDate(Friendly name of date field, date field name, error list) */
	errorPart="";
	errorMess="";
	if(ErrListX.indexOf(DateFriendly)<0) {
	errorPart = isDateReturn(document.forms[0][DateFieldName]);
	if(errorPart!="") { 
		errorMess = DateFriendly + " : " + errorPart 
		} else {
		return ""};
	}
	return(errorMess);
}
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
// is24hrTime(time to check, friendly name to display)
// field level validation
// displays full error message in an alert box
//------------------------------------------------------------------------------
function is24hrTime(timeCheck,fieldnamen) {
	ErrorMessTime = "Field input error : " + fieldnamen;
	timeMessCheck  = is24hrTimeCheck(timeCheck, fieldnamen);
	if(timeMessCheck) { 
	alert(ErrorMessTime+"\n\n"+is24hrTimeCheck(timeCheck, fieldnamen));
	return false;
	} else {return}
}
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
// is24hrTimeShortError(time to check, friendly name to display)
// returns a short error for use in the final validation box
//------------------------------------------------------------------------------
function is24hrTimeShortError(timeCheck,fieldnamen) {
	longError = is24hrTimeCheck(timeCheck, fieldnamen);
	if(longError) { shortError = longError.substr(0,longError.indexOf(".")); } else { return "" }
	if (shortError!="") { return "\n"+fieldnamen+ " : "+ shortError ; } else {return ""}
}
// -----------------------------------------------------------------------------
//------------------------------------------------------------------------------
// is24hrTimeCheck(time to check, friendly name of field to display on error)
// function checks format of time, using 24 hour clock
// has to be either hh:mm or h:mm
// doesn't check it if blank
// returns a full error message
//------------------------------------------------------------------------------
function is24hrTimeCheck(timeCheck, fieldnamen) {
		// if it's blank, no need to check it
		var timeCheck = timeCheck.value
		if (timeCheck=="") {
		return
		}
				
		// pattern match it against (digit)(digit):(digit)(digit)
		var regexp_pattern = /\d{2}(\:)\d{2}/
		var regexp_check = regexp_pattern.test(timeCheck)
		if (regexp_check==false) {
		return ("Please check the format of your time. It should look like : \n\n 12:14   or   01:37   or   23:59")
		}
		// split time into minutes and hours
		var combineTime=timeCheck.split(":")
		var checkHours = (combineTime[0])
		var checkMinutes = (combineTime[1])
		
		if (checkHours > 23) {
			return("Time not within the 24 hour clock. \n\n Please check your time is between 00:00 and 23:59")
		}
		
		if (checkMinutes > 59) {
			return("Time not within the 24 hour clock.  \n\n Please check your time is between 00:00 and 23:59")
		}
}
//----------------------------------------------------------------------