initialize: function() {
this.$input.val(this.$hidden.val());
var e = $.extend({}, acf.l10n.date_picker, {
dateFormat: “yymmdd”,
altField: this.$hidden,
altFormat: “yymmdd”,
changeYear: !0,
yearRange: “-100:+100”,
changeMonth: !0,
showButtonPanel: !0,
firstDay: this.o.first_day//Uncaught TypeError: Cannot read property ‘first_day’ of undefined
});