Thank you very much, this sounds encouraging !
Unfortunately my ActiveState installation bites me again.
There is no DateTime::Span module there available, only DateTime::Span::Common. If I start with DateTime::Span::Common (just a use declaration to test) it dies "Can't locate DateTime/Span.pm in @INC ..."
Trying to install with cpan from the command line brings an error message 
"Warning: Cannot install DataTime::span, don't know what it is.
Try the command

    i /DataTime::span/

to find objects with matching identifiers.

[download]
There is not DateTime::Duration module, only Datetime::Duration::Fuzzy.
:-( Update: Sorry! There is DataTime::Duration there, sorry, I have used the false script.

In reply to Re^2: Calculation of the time overlapping by vagabonding electron
in thread Calculation of the time overlapping by vagabonding electron

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