if (event.start.dateTime) {
var start = Utilities.formatDate(new Date(event.start.dateTime),Session.getScriptTimeZone(),'dd.MM.yyyy HH:mm') ;
} else {
var start = event.start.date;
}
var timeZone = Session.getScriptTimeZone();
var allDay = event.start.dateTime = "00:00" ? 'NO' : 'YES'