public static bool Overlaps(this DateInterval first, DateInterval second)
{
if (first is null)
{
throw new ArgumentNullException(nameof(first));
}
if (second is null)
{
throw new ArgumentNullException(nameof(second));
}
return(first.Contains(second.Start) || first.Contains(second.End) ||
second.Contains(first.Start) || second.Contains(first.End));
}
/// <summary>
/// Returns the intersection between the given interval and this interval.
/// </summary>
/// <param name="interval">
/// The specified interval to intersect with this one.
/// </param>
/// <returns>
/// A <see cref="DateInterval"/> corresponding to the intersection between the given interval and the current
/// instance. If there is no intersection, a null reference is returned.
/// </returns>
/// <exception cref="ArgumentException"><paramref name="interval" /> uses a different
/// calendar to this date interval.</exception>
public DateInterval?Intersection(DateInterval interval) =>
Contains(interval) ? interval
: interval.Contains(this) ? this
: interval.Contains(Start) ? new DateInterval(Start, interval.End)
: interval.Contains(End) ? new DateInterval(interval.Start, End)
: null;
