toTimeSpan method

Implementation

TimeSpan toTimeSpan() {
  final timeUnit = relativeDate?.timeUnit;
  final eventName = relativeDate?.eventName;
  final parsedTimeUnit = timeSpanUnitOf(timeUnit);
  final field = eventName != null
      ? TimeSpanUnit.year
      : parsedTimeUnit ?? TimeSpanUnit.year;
  return TimeSpan.ofSingleField(field, this.relativeDate?.amount ?? 1);
}