Ladda om ett JavaScript varje timme :)

<script type="text/javascript">

function spanishDate(d){
	var weekday=["Domingo","Lunes","Martes","Miercoles","Jueves","Viernes","Sabado"];
	var monthname=["Enero","Febrero","Marzo","Abril","Mayo","Junio","Julio","Agosto","Septiembre","Octubre","Noviembre","Diciembre"];
	return weekday[d.getDay()]+ "," +" "+d.getDate() + " de "+monthname[d.getMonth()]
}

var d = new Date()
document.write(spanishDate(d));

</script>

function startTimerMenu() {
    var now = new Date();
    var minutes = now.getMinutes();
    var seconds = now.getSeconds();
    setTimeout('refreshMenu()',(((60 - (minutes % 60) - ((seconds>0)?1:0)) * 60) + (60 - seconds)) * 1000);
	setTimeout("startTimerMenu()",3600000);
}

function refreshMenu() {
    
}

startTimerMenu();

<script type="text/javascript">

(function() {
 setInterval((function fn() {
  console.log('foo'); function spanishDate(d){
    var weekday=["Domingo","Lunes","Martes","Miercoles","Jueves","Viernes","Sabado"];
    var monthname=["Enero","Febrero","Marzo","Abril","Mayo","Junio","Julio","Agosto","Septiembre","Octubre","Noviembre","Diciembre"];
    return weekday[d.getDay()]+ "," +" "+d.getDate() + " de "+monthname[d.getMonth()]

}

var d = new Date()
document.write(spanishDate(d));
  return fn;
 })(), 10000);
})();

</script>