function datum() {
  var dayNames = new Array("So","Mo","Di","Mi","Do","Fr","Sa");
  
  var monthNames = new Array("Jan.","Feb.","März","Apr.","Mai","Juni","Juli","Aug.","Sept.","Okt.","Nov.","Dez.");
  var now = new Date();
    
  if (now.getMinutes() < 10) minut = "0" + now.getMinutes();
  else minut = now.getMinutes();
  document.write(dayNames[now.getDay()] + ". - " + now.getDate() + "." + monthNames[now.getMonth()] +  now.getFullYear() + " - " + now.getHours() + ":" + minut);

}