怪文書

isXmasBusy.gs

// -*- mode:js2; coding:utf-8 -*-
// Created: Wed Dec  9 17:00:55 2015
function isXmasBusy() {
  var calendars = CalendarApp.getAllOwnedCalendars();

  var xmas_eve = new Date(2015, 11,24);
  var xmas = new Date(2015, 11, 25);

  for (i=0,len=calendars.length;i!=len;i++) {
    var calendar = calendars[i];
    if (calendar.getEventsForDay(xmas_eve).length != 0 ||
        calendar.getEventsForDay(xmas).length != 0) {
      return true;
    }
  }

  return false;
}