//prüft ob das übergebene Datum richtig ist
function checkDate(ChkDate, delim){
	var Year=parseInt(ChkDate.substring(6,10), 10);
	var Month=parseInt(ChkDate.substring(3,5), 10);
	var Day=parseInt(ChkDate.substring(0,2), 10);

	if ((ChkDate.charAt(2)==delim) && (ChkDate.charAt(5)==delim) && (ChkDate.length==10) ){
		if ((Day<=31) && (Day>=1) && (Month>=1) && (Month<=12)){
			if ((Month==1)||(Month==3)||(Month==5)||(Month==7)||(Month==8)||(Month==10)||(Month==12)) return true;
			else {
				if ((Day<=30) && (Day>=1)){
					if ((Month==4)||(Month==6)||(Month==9)||(Month==11)) return true; 
					else {
						if ((Day<=28) && (Day>=1)) return true;
						else {
							if (Day==29) {
								if ((Year%4)==0) {
									if ((Year%100)!=0) return true;
									else {
										if ((Year%400)==0) return true;
										else return false;
									}
								}
								else return false;
							}
							else return false;
						}
					}
				}
				else return false;
			}
		}
		else return false;
	}
	else return false;
}

//prüft ob Datum1 sich vor Datum2 befindet
//Datumsformat dd.mm.yyyy dd-mm-yyyy ...
function dateB4Date(date1, date2){
  var d1y=parseInt(date1.substring(6,10), 10);
	var d1m=parseInt(date1.substring(3,5), 10);
	var d1d=parseInt(date1.substring(0,2), 10);
  var d2y=parseInt(date2.substring(6,10), 10);
	var d2m=parseInt(date2.substring(3,5), 10);
	var d2d=parseInt(date2.substring(0,2), 10);
  	
  var nDate1 = new Date(d1y,d1m-1,d1d);
  var nDate2 = new Date(d2y,d2m-1,d2d);
  if(nDate1.getTime()<nDate2.getTime()){
    return true;
   }else {
     return false;
    }
}

//prüft ob Datum1 sich nach HEUTE befindet
//Datumsformat dd.mm.yyyy dd-mm-yyyy ...
function dayAfterToday(date1){
  var d1y=parseInt(date1.substring(6,10), 10);
	var d1m=parseInt(date1.substring(3,5), 10);
	var d1d=parseInt(date1.substring(0,2), 10);
  	
  var nDate1 = new Date(d1y,d1m-1,d1d+1);
  var today = new Date();
  if(nDate1.getTime() >= today.getTime()){
    return true;
   }else {
     return false;
    }
}


function isDigit( ch ){
    if ( (ch >= '0') && (ch <= '9') )
      return true;
    else
      return false;
  }


  function isAlpha( ch ){
    if ( ((ch >= 'a') && (ch <= 'z')) || ((ch >= 'A') && (ch <= 'Z')) )
      return true;
    else
      return false;
  }


  function isAlnum( ch ){
    if ( isAlpha( ch ) || isDigit( ch ) )
      return true;
    else
      return false;
  }


  function notIn( str1, str2 ){
    var i = 0;
    var j = str2.length;
    for( ; i<j; i++ )
    {
      var str3 =  str2.charAt(i);
      if( str1.indexOf( str3 ) != -1 )
        return false;
    }
    return true;
  }


  function checkUsername( username, mustBeQuoted ){
    var i = 0;
    var j = username.length;
    if ( username.charAt(0) != '"' )
    {
      if ( (username.charAt(0) <  ' ') || (username.charAt(0) >  '~')
            || !notIn( mustBeQuoted, username.charAt(0) ) )
        return false;
      for( i=1; i<j; i++ ){
        if ( ( (username.charAt(i) < ' ') || (username.charAt(i) >  '~')
              || !notIn ( mustBeQuoted, username.charAt(i) ) )
             && ( username.charAt(i-1) != '\\' ) )
          return false;
      }
    }
    else{
      if ( username.charAt( j-1 ) != '"' )
        return false;
      for( i=1; i<j-1; i++ ){
        if ( ( (username.charAt(i) == '\n') || (username.charAt(i) == '\r')
              || (username.charAt(i) == '\"') )
            && (username.charAt(i-1) != '\\') )
          return false;
      }

    }
    return true;
  }


  function checkNr ( nr ){
    var i=0;
    var j=nr.length;

    if( j < 1 )
      return false;

    for( ; i<j; i++ )
      if( ( nr.charAt(i) < '0' ) || ( nr.charAt(i) > '9' ) )
        return false;

    return true;
  }


  function checkIpnr( ipnr ){
    var iL=0;
    var iC=0;
    var i=0;
    var sNr = "";

    for( ; i< ipnr.length; i++ ){
      if ( ipnr.charAt(i) == '.' ){
        if ( !iL || (iL> 3) || parseInt( sNr,10 ) > 255 )
          return false;
        iC++;
        iL = 0;
        sNr = "";
        continue;
      }
      if ( isDigit ( ipnr.charAt(i) ) ){
        iL++;
        sNr = sNr + ipnr.charAt(i);
        continue;
      }
      return false;
    }

    if ( parseInt( sNr,10 ) > 255 )
      return false;
    if ( ( (iC==3) && (iL>=1) && (iL<=3) ) || ( (iC==4) && (!iL) )  )
      return true;
    else
      return false;
  }


  function checkFqdn( fqdn ){
    var iL=0;
    var iC=0;
    var i=fqdn.length-1;

    if ( (fqdn.charAt(0) == '.') || (fqdn.charAt(0) == '-') )
      return false;
    if ( fqdn.charAt(i) == '.' )
      i=i-1;

    for( ; i>=0; i-- ){
      if ( fqdn.charAt(i) == '.' ){
        if ( iL < 2 && iC < 2 )
          return false;
        if ( fqdn.charAt(i-1) == '-' )
          return false;
        iC++;
        iL = 0;
        continue;
      }
      if ( isAlnum ( fqdn.charAt(i) ) ){
        iL++;
        continue;
      }
      if ( fqdn.charAt(i) == '-' ){
        if ( !iL )
          return false;
        iL++;
        continue;
      }
      return false;
    }

    if ( !iC || ( iL == 1 && iC < 2 ) || ( !iL && iC==1 ) ) {
      return false;
    }

    return true;

  }


  function checkHostname( hostname ){
    if ( hostname.charAt(0) == '[' ){
      if ( hostname.charAt(hostname.length-1) != ']' )
        return false;
      var ipnr = hostname.substring( 1, hostname.length -1 );
        return checkIpnr( ipnr );
    }

    if ( hostname.charAt(0) == '#' ){
      var nr = hostname.substring( 1, hostname.length );
        return checkNr( nr );
    }

    return checkFqdn( hostname );
  }


  function checkEmailAdr( address ){
    var status = true;
    var username = "";
    var hostname = "";

    if ( address.length < 8 )
      return false;

    var seperate = address.lastIndexOf("@");
    if ( seperate == -1 )
      return false;

    username = address.substring(0, seperate );
    if ( ! checkUsername( username, "<>()[],;:@\" " ) )
      return false;

    hostname = address.substring(seperate+1, address.length );
    if ( ! checkHostname( hostname ) )
      return false;

    return true;
  }


  function checkEmail( email, allowFullname ){
    var existFullname = false;
    var status = true;
    var fullname = "";
    var adress = "";
    if ( email.length < 8 )
      return false;
    var emailBegin = email.indexOf("<");
    var emailEnd = email.lastIndexOf(">");

    if ( (emailBegin == -1) && (emailEnd == -1) )
      return checkEmailAdr( email );

    if ( ( (emailBegin == -1) && (emailEnd != -1) )
        || ( (emailBegin != -1) && (emailEnd == -1) ) )
      return false;

    adress = email.substring( emailBegin+1, emailEnd );

    if ( ! checkEmailAdr( adress ) )
      return false;

    if ( email.length == adress.length + 2 )
      return true;
    else
      if ( ! allowFullname )
        return false;

    if ( emailEnd == email.length - 1 ){
      if ( emailBegin == 0 )
        return true;
      if ( email.charAt( emailBegin -1 ) != ' ' )
        return false;
      fullname = email.substring( 0, emailBegin-1 );
      return checkUsername ( fullname, "<>()[],;:@\"" );
    }

    return false ;

  }