Another (maybe simpler) way of truncating:

sub hour_in_range {
    my ($dt_s, $dt_e, @hours) = @_;

    for my $hour (@hours) {
        my $dt = $dt_s->clone()
                      ->truncate( to => 'day' )
                      ->add( hours => $hour );

        $dt->add( days => 1 ) if $dt < $dt_s;

        return 1 if $dt <= $dt_e;
    }

    return 0;
}

[download]

In reply to Re^2: Check if Date interval contains Hour X by alexm
in thread Check if Date interval contains Hour X by gulden

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