var lastYear = moment(firstDay).subtract(1, 'month').year(); L636: var daysInLastMonth = moment([lastYear, lastMonth]).daysInMonth(); L637: var dayOfWeek = firstDay.day(); L638: L639: //initialize a 6 rows x 7 columns array for the calendar L640: var calendar = []; L641: calendar.firstDay = firstDay; L642: calendar.lastDay = lastDay; L643: L644: for (var i = 0; i < 6; i++) { L645: calendar[i] = []; L646:...