Googleカレンダーの予定をチャットワークに毎日自動で投稿する方法

function sendSchedule() {
  var myCals=CalendarApp.getCalendarById('xxxxxx'); //1.カレンダーID
  var myEvents=myCals.getEventsForDay(new Date());
  var strBody = "[info][title]" + Utilities.formatDate(new Date(), 'JST', 'yyyy/MM/dd') + "予定[/title]" //2.配信文章

  for(var i=0;i<myEvents.length;i++){
    var strTitle=myEvents[i].getTitle();
    var strStart=_HHmm(myEvents[i].getStartTime());
    strBody=strBody + strStart + '｜' + strTitle + '\n';
  }
  strBody = strBody + 'カレンダー：xxxxxx[/info]'; //2.配信文章
  var cwClient = ChatWorkClient.factory({token: 'xxxxxx'}); //3.チャットワークのトークン
  cwClient.sendMessage({
    room_id:xxxxxx, //4.チャットワークのルームID
    body: strBody
  });
  deleteTrigger();
}

function _HHmm(str){
  return Utilities.formatDate(str, 'JST', 'HH:mm');
}

function isBusinessDay(date){
  if (date.getDay() == 0 || date.getDay() == 6) {
    return false;
  }
  const calJa = CalendarApp.getCalendarById('ja.japanese#holiday@group.v.calendar.google.com');
  if(calJa.getEventsForDay(date).length > 0){
    return false;
  }
  return true;
}

function setTrigger() {
  var triggerDay = new Date();
  triggerDay.setHours(xx); //5.投稿時間（時）
  triggerDay.setMinutes(xx); //5.投稿時間（分）
  if (isBusinessDay(triggerDay)){
  ScriptApp.newTrigger("sendSchedule").timeBased().at(triggerDay).create();
  }
}

function deleteTrigger() {
  var triggers = ScriptApp.getProjectTriggers();
  for(var i=0; i < triggers.length; i++) {
    if (triggers[i].getHandlerFunction() == "sendSchedule") {
      ScriptApp.deleteTrigger(triggers[i]);
    }
  }
}