YLShipBuildLandMap/YLShipBuildLandMap.Web/wwwroot/app/main/js/site.js

// call this from the developer console and you can control both instances
var calendars = {};

$(document).ready(function () {

    // assuming you've got the appropriate language files,
    // clndr will respect whatever moment's language is set to.
    // moment.lang('ru');

    // here's some magic to make sure the dates are happening this month.
    var thisMonth = moment().format('YYYY-MM');

    var eventArray = [
        {startDate: thisMonth + '-10', endDate: thisMonth + '-14', title: 'Multi-Day Event'},
        {startDate: thisMonth + '-23', endDate: thisMonth + '-26', title: 'Another Multi-Day Event'}
    ];

    // the order of the click handlers is predictable.
    // direct click action callbacks come first: click, nextMonth, previousMonth, nextYear, previousYear, or today.
    // then onMonthChange (if the month changed).
    // finally onYearChange (if the year changed).

    calendars.clndr1 = $('.cal1').clndr({
        events: eventArray,
        // constraints: {
        //   startDate: '2013-11-01',
        //   endDate: '2013-11-15'
        // },
        clickEvents: {
            click: function (target) {
                console.log(target);
                if ($(target.element).hasClass('inactive')) {
                    console.log('not a valid datepicker date.');
                } else {
                    console.log('VALID datepicker date.');
                }
            },
            nextMonth: function () {
                console.log('next month.');
            },
            previousMonth: function () {
                console.log('previous month.');
            },
            onMonthChange: function () {
                console.log('month changed.');
            },
            nextYear: function () {
                console.log('next year.');
            },
            previousYear: function () {
                console.log('previous year.');
            },
            onYearChange: function () {
                console.log('year changed.');
            }
        },
        multiDayEvents: {
            startDate: 'startDate',
            endDate: 'endDate'
        },
        showAdjacentMonths: true,
        adjacentDaysChangeMonth: false
    });

    // calendars.clndr2 = $('.cal2').clndr({
    //   template: $('#template-calendar').html(),
    //   events: eventArray,
    //   startWithMonth: moment().add('month', 1),
    //   clickEvents: {
    //     click: function(target) {
    //       console.log(target);
    //     }
    //   }
    // });

    // bind both clndrs to the left and right arrow keys
    $(document).keydown(function (e) {
        if (e.keyCode == 37) {
            // left arrow
            calendars.clndr1.back();
            calendars.clndr2.back();
        }
        if (e.keyCode == 39) {
            // right arrow
            calendars.clndr1.forward();
            calendars.clndr2.forward();
        }
    });

});