Datepicker更新时间

Question

我有年份和月份的datepicker选择

http://i.stack.imgur.com/8DXBh.png

更改其在输入中反映的日期后，再次打开显示日期而不是选择一个

http://i.stack.imgur.com/2E5lB.png

$('[month_day_picker]').datepicker({
        changeMonth: true,
        changeYear: true,
        showButtonPanel: true,
        dateFormat: "yy-mm",
      //  yearRange: '2016:+0',
        beforeShow : function() {
            $("#ui-datepicker-div").addClass('custom-hide-calendar');
        },
        onClose: function(dateText, inst) {
            $(this).datepicker('setDate', new Date(inst.selectedYear, inst.selectedMonth, 1));
            $("#ui-datepicker-div").removeClass('custom-hide-calendar');
        }
    });