Quickstart: GAS Calendar - US Holidays

code.gs

function doGet() { 
 var calendarId = 'en.usa#[email protected]';                                     // Public calendar we're connecting to
  var optionalArgs = {                                                                              // See optionalArgs at http://bit.ly/GAScal_eventlist
    timeMin: (new Date()).toISOString(),                                                            // Setting today as the minimal time requirement
    showDeleted: false,                                                                             // Only show active events
    singleEvents: true,                                                                             // Return recurring events as individual events
    maxResults: 10,                                                                                 // Max of 10 records
    orderBy: 'startTime'                                                                            // Order chronologically
  };
  var response = Calendar.Events.list(calendarId, optionalArgs);                                    // Get the calendar content, based on parameters
  var events = response.items;                                                                      // Set variable "events" equal to items returned in previous line
  if (events.length > 0) {                                                                          // If there are more than zero events
    for (i = 0; i < events.length; i++) {                                                           // For each of the events returned,
      var event = events[i];                                                                        // Run through loop of events
      var when = event.start.dateTime;                                                              // Set variable "when" equal to the start.dateTime value
      if (!when) {
        when = event.start.date;                                                                    // If when is empty, set it equal to start.date - this is when an event is marked as "all day"
      }
      Logger.log('%s (%s)', event.summary, when);                                                   // Output "event name (and date)"
    }
    // return ContentService.createTextOutput(events).setMimeType(ContentService.MimeType.TEXT);
  } else {
    Logger.log('No upcoming events found.');                                                        // If there are no events, show this message in the log
  }
}