In case anyone is wondering, I've been trying to tidy up loose ends to 
finally get this out.

The first loose end was the 'find next' concept. This sounded easy, but 
is in fact very hard. The problem is with DST shifts, where the same 
time appears twice in quick succession. For now, I've shelved this work.

The second loose end is trying to work out if a previous bug fix for 
empty intervals was valid. Are there any mathematicians present?


Consider an interval from 09:00 to 10:00. Its half-open - [09:00,10:00).

Does this interval contain an empty interval [09:00,09:00) ?
Does this interval abut an empty interval [09:00,09:00) ?
Does this interval overlap an empty interval [09:00,09:00) ?

As far as I can tell, there is no 'right' answer to this as an empty 
interval is rather ill-defined. Do you consider it as a point on the 
timeline (thus it is contained and abuts). Or do you consider it as 
starting at and excluding 09:00 (thus it is not contained as it excludes 
09:00, but does abut)

Any of this make any sense? Anyone know interval theory?

Stephen

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