How to Check for All-Day Events on a Specific Date Using Google Apps Script

function checkAllDayEvents() {
  var calendarId = 'primary'; // Use 'primary' for your primary calendar or specify a different one
  var calendar = CalendarApp.getCalendarById(calendarId);
  var dateToCheck = new Date('2024-05-01'); // Set the date you want to check (YYYY-MM-DD)

  // Define the start and end times of the date to check
  var startTime = new Date(dateToCheck);
  var endTime = new Date(dateToCheck);
  endTime.setDate(endTime.getDate() + 1); // Move to the next day

  // Get all events for the specified date range
  var events = calendar.getEvents(startTime, endTime);

  // Check for all-day events
  var allDayEvents = events.filter(function(event) {
    return event.isAllDayEvent();
  });

  if (allDayEvents.length > 0) {
    Logger.log('There are all-day events on ' + dateToCheck.toDateString());
    allDayEvents.forEach(function(event) {
      Logger.log('Event Title: ' + event.getTitle()); // Logging the title of each all-day event
    });
  } else {
    Logger.log('No all-day events found on ' + dateToCheck.toDateString());
  }
}