function changeColor(darkMode) {
    calendar.refetchEvents();
    var dayNames = document.querySelectorAll('a.fc-col-header-cell-cushion');
    var dayNumbers = document.querySelectorAll('.fc-daygrid-day-number');
    var color;
    if (darkMode) {
        color = "white";
        document.getElementById('fc-dom-1').classList.add('white');
    } else {
        color = "black";
        document.getElementById('fc-dom-1').classList.remove('white');
    }
    dayNames.forEach((dayname) => {
        dayname.style.color = color;
    });
    dayNumbers.forEach((daynumber) => {
        daynumber.style.color = color;
    });
}