function montlyCalendar ([day,month,year]) {
    let days = ["Sun","Mon","Tue","Wed","Thu","Fri","Sat"];
    let result = '<table>\n<tr>';
    for (x of days){
        result += `<th>${x}</th>`
    }
    result+='</tr>\n';
    let daysInWeek = 1;
    let inputDate = new Date(year,month-1,day);
    let firstDay = new Date(year,month-1,1);
    let firstDate = firstDay.setDate(firstDay.getDate() - firstDay.getDay());
    let lastDay = new Date(year, month,0);
    let lastDate = lastDay.setDate(lastDay.getDate() + (7-(lastDay.getDay()+1)%7));
    for (let dm = new Date(firstDate); dm <=new Date(lastDate); dm.setDate(dm.getDate()+1)){
        if ((dm.getDay()+1)%7==1)
            result+='  <tr>';
        if (dm.getMonth()<inputDate.getMonth())
           result+=`<td class="prev-month">${dm.getDate()}</td>`;
        else if (dm.getMonth()>inputDate.getMonth())
            result+=`<td class="next-month">${dm.getDate()}</td>`;
        else if (dm.getDate()==inputDate.getDate())
            result+=`<td class="today">${dm.getDate()}</td>`
        else
            result+=`<td>${dm.getDate()}</td>`;
        if ((dm.getDay()+1)%7==0)
            result+='</tr>\n'
    }
    return result;
}