Iterates through all Google Calendar events for the main calendar and deletes them (moves to trash)

CalendarCleanup.gs

function doGet() { /* Get your default calendar */
    var cal  = CalendarApp.getDefaultCalendar();
  
    var yest = new Date().getTime() - 604800000; //milliseconds in a day -- go back one week
    var start = new Date(0);
    var end = new Date(yest);

    /* Get all events from start date upto time */
    var events = cal.getEvents(start, end);

    var body = "Calendar - Events Log - Status" + "\n\n-----------------------\n";
    body += cal.getName() + "\n\n";

    if (events.length > 0) {
        var tz = Session.getScriptTimeZone();

        /* Build-up log */
        for (var i = 0; i < events.length; i++) {
            body += Utilities.formatDate(events[i].getStartTime(), tz, "MM:dd:YYYY HH:mm") + " ～ ";
            body += Utilities.formatDate(events[i].getEndTime(), tz, "MM:dd:YYYY HH:mm") + " :";
            body += events[i].getTitle();
            events[i].deleteEvent();
            body += "   -   Deleted!\n";
            Utilities.sleep(100);
        }
    }
    Logger.log(body);
}

function myFunction() {
   doGet();
}