如何在日期选择器中设置 3 个月的日期范围？

我这里有从日期到日期。我想将 maxDate 设置为 3 个月，具体取决于起始日期选择。如果用户选择从日期 01-01-2014，#to maxDate 应该是基于起始日期的接下来 3 个月，例如 (01-04-2014)。

$(function () {
    $("#from").datepicker({
        minDate: "dateToday",
        changeMonth: true,
        dateFormat: 'dd-mm-yy',

        onClose: function (selectedDate) {
            $("#to").datepicker("option", "minDate", selectedDate);
        }
    });
    $("#to").datepicker({
        minDate: "dateToday",
        changeMonth: true,
        dateFormat: 'dd-mm-yy',
        maxDate: selectedDate + "+3M", //I want to set condition like this

        onClose: function (selectedDate) {
            $("#from").datepicker("option", "maxDate", selectedDate);
        }
    });
});

给我一些建议来解决我的问题

小提琴演示 http://jsfiddle.net/cse_tushar/M2RS8/

$(function () {
    $("#from").datepicker({
        minDate: "dateToday",
        changeMonth: true,
        dateFormat: 'dd-mm-yy',
        onClose: function (selectedDate, instance) {
            if (selectedDate != '') { //added this to fix the issue
                $("#to").datepicker("option", "minDate", selectedDate);
                var date = $.datepicker.parseDate(instance.settings.dateFormat, selectedDate, instance.settings);
                date.setMonth(date.getMonth() + 3);
                console.log(selectedDate, date);
                $("#to").datepicker("option", "minDate", selectedDate);
                $("#to").datepicker("option", "maxDate", date);
            }
        }
    });
    $("#to").datepicker({
        minDate: "dateToday",
        changeMonth: true,
        dateFormat: 'dd-mm-yy',
        onClose: function (selectedDate) {
            $("#from").datepicker("option", "maxDate", selectedDate);
        }
    });
});