aquí tienes este codigo:
<!--
mydate = new Date();
myday = mydate.getDay();
mymonth = mydate.getMonth();
myweekday= mydate.getDate();
weekday= myweekday;
if(myday == 0)
day = " Domingo, "
else if(myday == 1)
day = " Lunes, "
else if(myday == 2)
day = " Martes, "
else if(myday == 3)
day = " Miércoles, "
else if(myday == 4)
day = " Jueves, "
else if(myday == 5)
day = " Viernes, "
else if(myday == 6)
day = " Sábado, "
if(mymonth == 0)
month = "Enero "
else if(mymonth ==1)
month = "Febrero "
else if(mymonth ==2)
month = "Marzo "
else if(mymonth ==3)
month = "Abril "
else if(mymonth ==4)
month = "Mayo "
else if(mymonth ==5)
month = "Junio "
else if(mymonth ==6)
month = "Julio "
else if(mymonth ==7)
month = "Agosto "
else if(mymonth ==8)
month = "Setiembre "
else if(mymonth ==9)
month = "Octubre "
else if(mymonth ==10)
month = "Noviembre "
else if(mymonth ==11)
month = "Diciembre "
document.write("<font face=tahoma, size=1, color=blue>"+ day);
document.write(myweekday+" de "+month+ "</font>");
// -->
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