JavaScript - Imprimir fecha de hace 4 meses y que se mantenga la condición.

<SCRIPT>

// Array de los meses

var monthNames = new makeArray(12);

monthNames[0] = "Enero";

monthNames[1] = "Febrero";

monthNames[2] = "Marzo";

monthNames[3] = "Abril";

monthNames[4] = "Mayo";

monthNames[5] = "Junio";

monthNames[6] = "Julio";

monthNames[7] = "Agosto";

monthNames[8] = "Septiembre";

monthNames[9] = "Octubre";

monthNames[10] = "Noviembre";

monthNames[11] = "Diciembre";

// Array de los días

var dayNames = new makeArray(7);

dayNames[0] = "Domingo";

dayNames[1] = "Lunes";

dayNames[2] = "Martes";

dayNames[3] = "Miércoles";

dayNames[4] = "Jueves";

dayNames[5] = "Viernes";

dayNames[6] = "Sábado";

var now = new Date();

var year = now.getYear();

if (year < 2000) year = year + 1900;

function makeArray(len)

{

for (var i = 0; i < len; i++) this[i] = null;

this.length = len;

}

</SCRIPT>

document.write( dayNames[now.getDay()] + " " + now.getDate() + " de " + monthNames[now.getMonth()] + " " +" de " + year);