/**
 * Author: Matt Kruse <matt@mattkruse.com>
 * http://www.mattkruse.com/
 *
 * 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;
}
function checkDate(obj) {
  if (obj.value != "") {
    if ( isDate(obj.value, "yyyy/MM/dd")) {
      return true;
    }
    else if ( isDate(obj.value, "yyyyMMdd") ) {
      var date = getDateFromFormat(obj.value, "yyyyMMdd");
      var tuc = new Date();
      tuc.setTime(date);
      var temp = formatDate(tuc, "yyyy/MM/dd");
      obj.value = temp;
      return true;
    }
    else {
      alert("日付を正しく入力してください");
      obj.focus();
      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;
}
/**
 * Author: Matt Kruse <matt@mattkruse.com>
 * http://www.mattkruse.com/
 *
 * 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 isJPDateTime(val){  
  var year;
  var month;
  var  day;
  var val = trimAll(val);
  var result=true;
  
  if( val.length != 8 && val.length != 12 )
  {
    result=false;
  }
  else {
		year = val.substring(0,4);
		if (parseFloat(year)>=1800){
      month = val.substring(4,6);
		  day = val.substring(6,8);  
		  temp = year + "/" + month + "/" + day;
		  if(!isDate(temp, "yyyy/MM/dd")) result = false;
		  if( val.length == 12 ) {
		    hour = val.substring(8,10);  
		    second = val.substring(10,12);  
		    if( !isNumeric( hour ) || parseFloat( hour ) > 23 ) result=false;;
		    if( !isNumeric( second ) || parseFloat( second ) > 59 ) result=false;
		  }
	  }
	  else {
	    result=false;
	  }
  }
	return result;
}
function isDate(val,format) {
  // 20070822 : tho add format yyyyMMdd
  if(format=="yyyyMMdd")
    return isJPDateTime(val);
  //
  var date=getDateFromFormat(val,format);
  if (date==0) { return false; }
  return true;
}
function checkDate(obj) {
  if (obj.value != "") {
    if ( isDate(obj.value, "yyyy/MM/dd")) {
      return true;
    }
    else if ( isDate(obj.value, "yyyyMMdd") ) {
      var date = getDateFromFormat(obj.value, "yyyyMMdd");
      var tuc = new Date();
      tuc.setTime(date);
      var temp = formatDate(tuc, "yyyy/MM/dd");
      obj.value = temp;
      return true;
    }
    else {
      alert("日付を正しく入力してください");
      obj.focus();
      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;
}
//add months
function DateAddMonths( date, months ){
	
	year = date.getFullYear();
	month = date.getMonth()+ 1;
	day = date.getDate();
	
	var daysinmonth= new Array(0,31,28,31,30,31,30,31,31,30,31,30,31);
	
	if ( ( (year%4 == 0)&&(year%100 != 0) ) || (year%400 == 0) ) {
		daysinmonth[2] = 29;
	}
	var _years, _months;
	if( months + month > 12 ){
		_years = parseInt( ( months - ( 12 - month )) / 12, 10) + 1;
		_months = ( months - ( 12 - month )) % 12;
	}
	else if( months + month < 0 ){
		_years = ( months + month ) / 12;
		_months = 12 + ( months + month ) % 12;
	}
	else { 
		_months = months + month; 
		_years = 0;
		if(_months == 0)
		{
			_months = 12;
			_years = -1;
		}
			
	}
 	 
	year = year + _years;
	month = _months;
	
	dayOfMonth = daysinmonth[month];
	if( day > dayOfMonth ) day = dayOfMonth;
	month = month - 1;
	
	date.setFullYear( year, month, day);
}
//add days
function DateAddDays( date, days ){
	
	year = date.getFullYear();
	month = date.getMonth() + 1;
	day = date.getDate();
	
	var daysinmonth= new Array(0,31,28,31,30,31,30,31,31,30,31,30,31);
	
	if ( ( (year%4 == 0)&&(year%100 != 0) ) || (year%400 == 0) ) {
		daysinmonth[2] = 29;
	}
	dayOfMonth = daysinmonth[month];
	
	if( day + days > dayOfMonth ) {
	
	   if( month < 12 ) month = month + 1;
	   else {
			 month = 1;
			 year = year + 1;
	   } 
	   
	   date.setFullYear( year, month-1, 1 );
	   
	   DateAddDays( date, days - ( dayOfMonth - day ) - 1);		
	   
	}
	else if( day + days < 0 ) {
	 
	 if( month > 0 ) month = month - 1;
	   else {
			 month = 12;
			 year = year - 1;
	   } 
	   dayOfMonth = daysinmonth[month];
	   
	   date.setFullYear( year, month-1, dayOfMonth);
	   
	   DateAddDays( date, days + day );		
	   
	}
	else {
	  date.setFullYear( year, month-1, day + days );
	}
}