abc

function stringToDate(string) {
    var date = string.split("/");
    return new Date(date[2], date[1] - 1, date[0]);
}

function sortTableByDate(n) {
    var table,
        rows,
        switching,
        i,
        x,
        y,
        shouldSwitch,
        dir,
        switchcount = 0;
    table = document.getElementById("tbl");
    switching = true;
    //Set the sorting direction to ascending:
    dir = "asc";

    // Remove class asc and desc (arrow direction)
    // if (dir == "asc") {
    //     table.rows[0].cells[n].classList.remove("desc");
    // } else {
    //     table.rows[0].cells[n].classList.remove("asc");
    // }

    /*Make a loop that will continue until
    no switching has been done:*/
    while (switching) {
        //start by saying: no switching is done:
        switching = false;
        rows = table.rows;
        /*Loop through all table rows (except the
    first, which contains table headers):*/
        for (i = 1; i < rows.length - 1; i++) {
            //start by saying there should be no switching:
            shouldSwitch = false;
            /*Get the two elements you want to compare,
        one from current row and one from the next:*/
            x = rows[i].getElementsByTagName("TD")[n];
            y = rows[i + 1].getElementsByTagName("TD")[n];
            /*check if the two rows should switch place,
        based on the direction, asc or desc:*/
            if (dir == "asc") {
                if (stringToDate(x.innerHTML) > stringToDate(y.innerHTML)) {
                    //if so, mark as a switch and break the loop:
                    shouldSwitch = true;
                    break;
                }
            } else if (dir == "desc") {
                if (stringToDate(x.innerHTML) < stringToDate(y.innerHTML)) {
                    //if so, mark as a switch and break the loop:
                    shouldSwitch = true;
                    break;
                }
            }
        }
        if (shouldSwitch) {
            /*If a switch has been marked, make the switch
        and mark that a switch has been done:*/
            rows[i].parentNode.insertBefore(rows[i + 1], rows[i]);
            switching = true;
            //Each time a switch is done, increase this count by 1:
            switchcount++;
        } else {
            /*If no switching has been done AND the direction is "asc",
        set the direction to "desc" and run the while loop again.*/

            if (switchcount == 0 && dir == "asc") {
                dir = "desc";
                switching = true;
            }
        }
    }

    // table.rows[0].cells[n].classList.add(dir);
}