Neue Methode für Date-Object - ist das gutes scripting?

[new_prototyper]

Hallo liebe Leute,
fange gerade an, mich für das Aufbauen einer eigenen kleinen library zu begeistern.
U.a. möchte ich dem Date-Objekt eine neue Methode zuweisen, da ich aber in Sachen
Prototyping noch unerfahren bin, interessiert mich Eure Meinung, ob der Code gut
geschrieben ist, oder ob man den (viel) besser/sinnvoller schreiben kann:

  
// ein bestimmtes Array-Element löschen  
	Array.prototype.kill = function($) {  
		var m;  
		for (m=0;m<this.length;m++) {  
			if (m >= $) {  
				this[m] = this[m + 1];  
			}  
		}  
		this.length = this.length-1;  
	};  
  
// date = gewünschte Datums-Form als String; lang = Sprache  
// Beispiele: yyyy:2011, d:1, hh:17, wd:Dienstag, month:November  
// Beispiele für erlaubte Punktuation: , . ; - / :  
// Sprachen: deu=deutsch, eng=english, esp=espanol  
    Date.prototype.toLocalDate = function(date,lang) {  
        var i,  
            results = [],  
            year = this.getYear(),  
            Year = this.getFullYear(),  
            month = this.getMonth() + 1,  
            day = this.getDate(),  
            weekDay = this.getDay(),  
            hour = this.getHours(),  
            minute = this.getMinutes(),  
            second = this.getSeconds(),  
            wochentage = ["Sonntag","Montag","Dienstag","Mittwoch","Donnerstag","Freitag","Samstag"],  
            weekdays = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"],  
			diasdelasemana = ["Domingo","Lunes","Martes","Miercoles","Jueves","Viernes","Sabado"],  
            monate = ["Januar","Februar","März","April","Mai","Juni","Juli","August","September","Oktober","November","Dezember"],  
            months = ["January","February","March","April","May","June","July","August","Septembre","Octobre","Novembre","Decembre"],  
			meses = ["Enero","Febrero","Marzo","Abril","Mayo","Junio","Julio","Agosto","Septiembre","Octubre","Noviembre","Diciembre"],  
  
            val = date,  
            search1 = /\W/g,  
            search2 = /\w*/gi,  
            punc = val.match(search1),  
            settings = val.match(search2);  
            settings.length = settings.length - 1;  
  
        for (i = 0; i<settings.length; i++) {  
            if (settings[i] != "" && settings[i] != ",") {  
                results.push(evaluateSetting(settings[i]));  
            } else { results.push(punc[0]); punc.kill(0); }  
        }  
  
        function evaluateSetting(val) {  
             switch (val) {  
                case "yyyy"   : return Year; break;  
                case "yy"     : return year; break;  
                case "mm"     : return fix(month); break;  
                case "m"      : return month; break;  
                case "month"  : if (lang == "deu") { return monate[month]; }  
								else if (lang == "eng") { return months[month]; }  
								else if (lang == "esp") { return meses[month]; } break;  
                case "dd"     : return fix(day); break;  
                case "d"      : return day; break;  
                case "wd"     : if (lang == "deu") { return wochentage[weekDay]; }  
								else if (lang == "eng") { return weekdays[weekDay]; }  
								else if (lang == "esp") { return diasdelasemana[weekDay]; } break;  
                case "hh"     : return fix(hour); break;  
                case "h"      : return hour; break;  
                case "minmin" : return fix(minute); break;  
                case "min"    : return minute; break;  
                case "ss"     : return fix(second); break;  
                case "s"      : return second; break;  
                default       : return false;  
            }  
        };  
  
        function fix(val) {  
            if (val.toString().length == 1) {  
                val = "0" + val;  
            }  
            return val;  
        };  
  
        var localDate = results.join('');  
        return localDate;  
    };  
  
// Beispiel:  
var datum = new Date();  
alert(datum.toLocalDate('wd, d. month yyyy, hh:minmin','esp'));  
// ergibt z.B.: Martes, 1. Noviembre 2011, 17:41  

Vielen Dank!!