Delete old calendar events from Google Calendar

DeleteOldCalendarEvents.gs

// Adapted from http://webapps.stackexchange.com/questions/19513/how-to-delete-all-events-on-many-dates-all-at-once-but-not-the-whole-calendar-in/47768#47768

var fromDate = new Date(2016, 01, 1, 0, 0, 0);
var toDate = new Date(2016, 12, 31, 0, 0, 0);

removeEvents(fromDate, toDate, "MyFirstCalendar");
removeEvents(fromDate, toDate, "MySecondCalendar");

function removeEvents(fromDate, toDate, calendarName) {
  var calendar = CalendarApp.getCalendarsByName(calendarName)[0];
  if(calendar){
    var events = calendar.getEvents(fromDate, toDate);
    for(var i=0; i<events.length;i++){
      var ev = events[i];
      Logger.log(ev.getTitle()); // show event name in log
      ev.deleteEvent();
      Utilities.sleep(200) 
    }
  }
}