function calendar([day, month, year]){
    let html = '<table>\n';
    let currDay = Number(day);
    let currMonth = Number(month) - 1;
    let currYear = Number(year);
    let currDate = new Date(currYear, currMonth, currDay);
    let firstOfMonth = new Date(currYear, currMonth);
    let lastOfMonth = new Date(currYear, currMonth+1, 0);
    let calendarStartDay = new Date(currYear, currMonth, 1-firstOfMonth.getDay());
    let calendarLastDay = new Date(currYear, currMonth+1, 6-lastOfMonth.getDay());

    //Prints table header
    html+=" <tr><th>Sun</th><th>Mon</th><th>Tue</th><th>Wed</th><th>Thu</th><th>Fri</th><th>Sat</th></tr>\n";

    //Prints prev month days
    if(firstOfMonth.getDay()>0) {
    html += ' <tr>';
    }
    for (let i = calendarStartDay.getDay(); i<firstOfMonth.getDay(); i++){
        html+='<td class="prev-month">'+(calendarStartDay.getDate()+i)+'</td>';
    }

    //Prints curr mont days, bolds current day
    let tempDay = 1;
    while(tempDay <= lastOfMonth.getDate()){
        //first day of the week opens new table row
        if(new Date(currYear, currMonth, tempDay).getDay() == 0){
            html +=" <tr>";
        }
        if(tempDay == currDay){
            html+='<td class="today">'+tempDay+'</td>';
        }
        else {
            html+='<td>'+tempDay+'</td>';
        }

        //last day of the week closes table row
        if((new Date(currYear, currMonth, tempDay).getDay()+1) % 7 == 0){
            html +='</tr>\n';
        }
        tempDay++;
    }

    //Prints next month days
    if(lastOfMonth<calendarLastDay){
        for (let i = 1; i <= calendarLastDay.getDate(); i++){
            html+='<td class="next-month">'+i+'</td>';
        }
        html += '</tr>\n'
    }

    html += '</table>'
    return html;
}