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   day 1   |    day 2
     ----  |
...
         --|----
           |------
           | -------

my @now = localtime;
my $hour = $now[2];
...
$daychange = timelocal(@now);
# add one days seconds if running before midnight
$daychange += 86400 if $hour > 2;

    $sum{ $daystamp <= $stoptime ? 'first' : 'second' } += $linesum;