please include class GoogleAccess.

import com.google.api.client.util.DateTime;
import com.google.api.services.calendar.Calendar;
import com.google.api.services.calendar.model.Event;
import com.google.api.services.calendar.model.Events;

static L<Event> googleCalendar_eventsInDateRange(Calendar calendarService, long startDate, long endDate, int maxEvents) {
  ret googleCalendar_eventsInDateRange(calendarService, longRange(startDate, endDate), maxEvents);
}

static L<Event> googleCalendar_eventsInDateRange(Calendar calendarService, LongRange dateRange, int maxEvents) ctex {
  Events events = calendarService.events().list("primary")
    .setMaxResults(maxEvents)
    .setTimeMin(new DateTime(dateRange.start))
    .setTimeMax(new DateTime(dateRange.end))
    .setOrderBy("startTime")
    .setSingleEvents(true)
    .execute();
  ret events.getItems();
}