I came up with this ~one-line approach using Date::Calc and got it working, then i noticed in the pod and in gloryhack's post the Delta_DHMS method ... and in OP. i just totally missed the obvious.. anyways, here's a slighty-long-but-still-quick solution for the sake of TMTOWTDI (note it also blows up on the last one): 
#!/usr/bin/perl

use strict;
use Date::Calc qw(Time_to_Date Delta_Days);

while(<DATA>){

warn join ":",
        map { sprintf "%02d", $_ }
        do {
          my @d = Time_to_Date($_);
          ( Delta_Days((Time_to_Date(0))[0..2], @d[0..2]), @d[3..5] )
        };

}

__DATA__
1000
10000
100000
1000000
86400
86399
3600
3599
0
-1
313942941

[download]

In reply to Re: Converting seconds to DD:HH:MM:SS by davidrw
in thread Converting seconds to DD:HH:MM:SS by McDarren

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.