intersectionOf static method

DateRange? intersectionOf(DateRange a, DateRange b)

Returns the intersection of DateRanges a and b.

If a does not overlap with b, this factory returns null. Note that this is distinct from a DateRange with start == end == null, which represents a DateRange that is unbounded in both directions.

Implementation

static DateRange? intersectionOf(DateRange a, DateRange b) {
  final start = _laterStartDateOf(a.start, b.start);
  final end = _earlierEndDateOf(a.end, b.end);

  if (start != null && end != null && start > end) return null;

  return DateRange(start, end);
}