var mydate = new Date();
var year = mydate.getYear();
if(year < 1000) year += 1900;
var day = mydate.getDay();
var month = mydate.getMonth();
var daym = mydate.getDate();
if(daym < 10) daym = "0"+daym;
var dayarray = new Array("Domingo","Lunes","Martes","Miercoles","Jueves","Viernes","Sábado");
var montharray = new Array("Enero","Febrero","Marzo","Abril","Mayo","Junio","Julio","Agosto","Septiembre","Octubre","Noviembre","Diciembre");
document.write( dayarray[day] + " , " + daym + " de " + montharray[month] + " de " + year );