var date=new Date();

var tag=new Array("Sonntag","Montag","Dienstag","Mittwoch","Donnerstag","Freitag","Sonnabend");

var monat=new Array("Januar","Februar","März","April","Mai","Juni","Juli","August","September","Oktober","November","Dezember");

var st=tag[date.getDay()] + ", " + date.getDate() + ". " + monat[date.getMonth()] + " " + date.getFullYear();

document.write(st);