func (sva *StopVisitArchiver) setDepartureTimeEventFromKind(sv *StopVisit, kind StopVisitScheduleType) bigquery.NullTimestamp {
    t := bigquery.NullTimestamp{}
    departureTime := sv.Schedules.DepartureTimeFromKind([]StopVisitScheduleType{kind})
    if departureTime == (time.Time{}) {
        t.Valid = false