Which test? The first test where there is an intersection, or the second test where this is no intersection? Note that the end time and duration of each span is the same.

As I wrote in my update, I now understand why I get those results, but they are still inconsistent. An event that ends at 13:00 either intersects with an event that starts at 13:00, or it doesn't -- surely it can't do both.

In reply to Re^2: DateTime::Span intersection inconsistencies by mikeman
in thread DateTime::Span intersection inconsistencies by mikeman

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