Евгений

$("#calendar td").each(function () {
            if (parseInt($(this).text())) {
                let yearMonth = sheduleDate[$('#calendar td[data-year]').attr('data-year')][$('#calendar td[data-month]').attr('data-month')];
                // console.log(yearMonth)
                if (yearMonth) {
                    if (yearMonth.indexOf(parseInt($(this).text())) !== -1) {
                        $(this).addClass('scheduleday')
                        console.log(yearMonth)
                    }
                }
            }
        })