sub sec_to_ddmmss {
    my $t = shift;
    return int($t / 86400), (gmtime($t))[2, 1, 0];
}
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This is clever, but I'd like to see it commented because at first glance, it might appear erroneous. It should be better named too. I'd probably call it seconds_to_dhms(). Yours is broken in two respects: 1) you missed 'hh' for hours and 2) the doubled letters imply that your return values are formatted to two digits.

-sauoq
"My two cents aren't worth a dime.";