@AaronRomero Como puedo hacer en el input para que esto se dispare:
$( "#created_date_new" ).datepicker({
'dateFormat':'yy-mm-dd',
onSelect: function(dateText){
var seldate = $(this).datepicker('getDate');
seldate = seldate.toDateString();
seldate = seldate.split(' ');
var weekday=new Array();
weekday['Mon']="Lunes";
weekday['Tue']="Martes";
weekday['Wed']="Miércoles";
weekday['Thu']="Jueves";
weekday['Fri']="Viernes";
weekday['Sat']="Sábado";
weekday['Sun']="Domingo";
var dayOfWeek = weekday[seldate[0]];