LV Personal Code generator

gen.js

window.genPk = function (argument) {
    
    if (typeof argument == 'undefined'){
        argument = {};
    }
    
    if (typeof argument.date == 'undefined'){
        
    	startTime =new Date.today().add(-18).years();
    	endTime =new Date.today().add(-70).years();
    
    	//Random First part
    	sint= window.mt_rand(endTime.getTime() , startTime.getTime());
    }else{
        sint = Date.parse(argument.date).getTime();
    }
	
	dateGen = new Date(sint);
	totalDate = ' ' + dateGen.getFullYear();
	diff = totalDate.slice(2);
	century = totalDate.replace(diff, "").replace(" " , "");
	yr = ' '+ dateGen.getFullYear();
	day = dateGen.getUTCDate();
	if (day < 10){
	    day = '0' + (day + 1);
	}
	
	month = dateGen.getMonth();
	if (month < 10){
	    month = '0' + (month + 1);
	}
	
	Sstring =  day + '' + month + '' + yr.slice(-2) + '-'; //   getFullYear()
	 
	//generate X1 	X2 	X3 	X4 	X5 	X6 	- 	X7 	X8 	X9 	X10 	X11
	codeExploded = Sstring.split('-');
	dateData = window.str_split(codeExploded[0] , 1);
	secondHalf = [century];

	x = [];	 
	x[1] = dateData[0] * 1;
	x[2] = dateData[1] * 6;
	x[3] = dateData[2] * 3;
	x[4] = dateData[3] * 7;
	x[5] = dateData[4] * 9;
	x[6] = dateData[5] * 10; 
	x[7] = secondHalf[0] * 5;
	
	//generate random number
    secondHalf[1] = mt_rand(1 , 9);
	secondHalf[2] = mt_rand(1 , 9);
	secondHalf[3] = mt_rand(1 , 9); 
	
	if (typeof argument.second != 'undefined'){
	    if (typeof argument.second[0] != 'undefined'){
	        secondHalf[1] = argument.second[0];
	    }
	    
	    if (typeof argument.second[0] != 'undefined'){
	        secondHalf[2] = argument.second[1];
	    }
	    
	    if (typeof argument.second[0] != 'undefined'){
	        secondHalf[3] = argument.second[2];
	    }
	}
	 
	//build X
	x[7] = secondHalf[0] * 5;
	x[8] = secondHalf[1] * 8;
	x[9] = secondHalf[2] * 4;
	x[10] = secondHalf[3] * 2;	
	 
	total=0;
   	for (var i=x.length; i--;) {
   	    if (typeof x[i] != 'undefined'){
            total+=parseInt(x[i]);
   	    }
   	}
   	
	subVal = 1101 - total;
	secSubVal = subVal / 11 ;
	 
	if (parseInt(secSubVal) > secSubVal){
		roundedSecSubVal = parseInt(secSubVal) - 1;
	}else{
		roundedSecSubVal = parseInt(secSubVal);
	}
	 
	thirfSubVal = roundedSecSubVal * 11;
	checkSumm = (subVal - thirfSubVal);
	 
	secondHalf[4] = checkSumm;
	 
	//Validate
	genedPk = Sstring + secondHalf.join('');
	return genedPk;
};