in reply to Re^2: Calculation of the time overlapping
in thread Calculation of the time overlapping

And http://ppm4.activestate.com/author/FGLOCK.html lists DateTime-Set (distribution which has DateTime::Span) practically for all platforms
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Re^4: Calculation of the time overlapping
by vagabonding electron (Curate) on Mar 27, 2012 at 19:20 UTC

    Thank you very much!

    The link to the ppm repository and the hint that DateTime::Span is in the DateTime::Set distribution did it!
    Now have run the new script - in fact your script - against the "real life" data from the first post.
    Start: Tue Mar 27 21:12:58 2012 End: Tue Mar 27 21:13:34 2012
    That means over 15 times faster!
    Many many thanks again!
    VE