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