/*****************************************************************************
 * File Name        :   DateValidation.js
 * Description      :   JS file for Date Validation functions
 *
 * Modification Log:
 *  Ver			Date			Author				Comments
 *----------------------------------------------------------------------------
 *  0.00a   20 April 2002		Kamakshya Mishra	Initial Version
 *****************************************************************************/ 

// ------------------------------------------------------------------
// 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)
// Day of Month | dd (2 digits)      | d (1 or 2 digits)
// 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');
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 chkDate = new String(val);
	var len = parseInt(chkDate.length);
	var date=getDateFromFormat(val,format);
	
	if (date==0) { return false; }
	else if (chkDate.substring(len-4) == '0000') { 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=changeDateFormatFromTextBox(date1);
	var d2=changeDateFormatFromTextBox(date2);
	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 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["d"]=d;
	value["dd"]=LZ(d);
	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=now.getDate();
	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==4)	{
			if (year < 1970) { return 0;}
			}
			if (year.length==2) {
				if (year > 70) { year=1900+(year-0); }
				else { year=2000+(year-0); }
				}
			}
		else if (token=="MMM"){
			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()) {
					month=i+1;
					if (month>12) { month -= 12; }
					i_val += month_name.length;
					break;
					}
				}
			if ((month < 1)||(month>12)){return 0;}
			}
		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 false; }
			}
		else { if (date > 28) { return false; } }
		}
	if ((month==4)||(month==6)||(month==9)||(month==11)) {
		if (date > 30) { return false; }
		}
	// Correct hours value
	if (hh<12 && ampm=="PM") { hh+=12; }
	else if (hh>11 && ampm=="AM") { hh-=12; }
	var newdate=new Date(year,month-1,date,hh,mm,ss);
	return newdate.getTime();
	}


function changeDateFormatFromTextBox(value)
{
	if(value == "")
		return value;
	var newValue;
	if(value.length == 8) {
		newValue = value.substring(0, 4);
		newValue = newValue + "/";
		newValue = newValue + value.substring(4, 6);		
		newValue = newValue + "/";
		newValue = newValue + value.substring(6, 8);
		return newValue;
	} else {
		newValue = value.substring(0, 4);
		newValue = newValue + "/";
		newValue = newValue + value.substring(5, 7);		
		newValue = newValue + "/";
		newValue = newValue + value.substring(8, 10);
		return newValue;
	}
}

function changeDateFormat(value)
{
	var newValue;
	
	if(value.length != 8) {
   		return value;
	} else {
		newValue = 0;
		newValue = value.substring(0, 4);
		newValue = newValue + "/";
		newValue = newValue + value.substring(4, 6);		
		newValue = newValue + "/";
		newValue = newValue + value.substring(6, 8);
		return newValue;
	}

}

function todayDate(){
var today = new Date();
var day= today.getDate();
var month = today.getMonth();
var Year = today.getFullYear() ;
day = (day < 10)? "0"+day :""+day;
var monthYearStr= "January,February,March,April,May,June,July,August,September,October,November,December";
var monthsOfYear = monthYearStr.split(",");
var fullDate = monthsOfYear[month] + ' ' + day + ' ' + Year ;
document.write(fullDate);
}

// -----------------------------------------------------------------------------
// ValidateDate(dateString)
//
// This function takes a date string and Validate it againsst four 
//different formats ( YYYYMMDD , YYYY MM DD , YYYY-MM-DD , YYYY/MM/DD )
// Also IsDate Function does not Validate  dateString < 01 January 1970
// ---------------------------------------------------------------------------
function ValidateDate( dateVal ) {

	if ( isDate(dateVal,"yyyy/MM/dd")
		 ||  isDate(dateVal,"yyyyMMdd") 
		 ||  isDate(dateVal,"yyyy MM dd") 
		 || isDate(dateVal,"yyyy-MM-dd") ) 	{
		if(dateVal.length != 10 && dateVal.length != 8){
			return false;
		}
		return true;
	}
	
	return false;
}



function ConversionOfDateToSlash(value){
 var retVal;
 
 if(value == null || value==""){
  return value;
 }
 if (value.length == 10){
  retVal = changeDateFormatFromTextBox(value);
 } else if( value.length == 8) {
  retVal = changeDateFormat(value);
 } else {
	 retVal = value;
 }
 return retVal;
}


/*Added by vijay to display date in Japanese nad English  */
function date_EN_JP(i) {
	var lng = i;
	var dt = new Date();
	var x = dt.getMonth();
	var y;
	var strDate;
	if (lng == 'J' || lng == 'ja')
	{
		x = x+1;
		strDate = dt.getFullYear() + "\u5e74" +  x + "\u6708" + dt.getDate() + "\u65e5";
	}
	else
	{
		switch(x)
		{
			case 0:
					y = "January";
					break;
			case 1:
					y = "February";
					break;
			case 2:
					y = "March";
					break;
			case 3:
					y = "April";
					break;
			case 4:
					y = "May";
					break;
			case 5:
					y = "June";
					break;
			case 6:
					y = "July";
					break;
			case 7:
					y = "August";
					break;
			case 8:
					y = "September";
					break;
			case 9:
					y = "October";
					break;
			case 10:
					y = "November";
					break;
			case 11:
					y = "December";
					break;
			default: 
					y = "";
					break;
		}
		strDate = y + " " + dt.getDate() + ", " + dt.getFullYear();
	}
	return strDate;
}