I think I finally found a way to break the days apart that's a little different than yours: 
@combined = sort {$a->[0] <=> $b->[0]} (@listone,@listtwo);

for ($i=0; $i<scalar(@combined); $i++) {
     if (substr($combined[$i][0],0,2) != substr($combined[$i][1],0,2))
+ {
          splice(@combined,$i+1,0,[substr($combined[$i][1],0,2)."0000"
+,$combined[$i][1],$combined[$i][2]]);
          $combined[$i][1] = substr($combined[$i][0],0,2)."2359";
     }
}

[download]
I don't really understand though what you did for the day overlap piece. Do you mind adding comments or explaining the chunks? I'm still kinda new to perl :/

Thanks for the help!

In reply to Re^2: Date Array Convolution by alanonymous
in thread Date Array Convolution by alanonymous

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