Reservation form, show hours according to day of the week.

I need the reservation form to show a calendar to select the date of the appointment. This date can not be passed, nor on Saturdays and Sundays, three days from today. When the day of the week is selected, the selection of that day in question must be shown to select the time slot available that day. The data that only has to be sent are: -Selecciona un Centro Oi2* -Por favor, elige el servicio deseado.* -Día de la visita * -Horas disponibles * -- -Titulo*: Sra/Sr -Nombre* -Apellido 1º* -Apellido 2º* -E-mail* -Teléfono* -Fecha de nacimiento (opcional) -- -Calle y número -Ciudad -Código postal -Peticiones adicionales -Envíanos cualquier consulta o petición No Submit if no check * El envío de este formulario implica haber leído y aceptado el Aviso Legal y la Política de privacidad del prestador del servicio. And that all browsers work correctly as in Internet Explorer. It seems that the function getUTCDay () does not work correctly in Internet Explorer and Firefox it returns Nan