While this might not be exactly what you asked for (a pre-built command), I use these few subs quite a bit in my time code. Might be of help to you, or others. 
sub hms
 {
    my ($s) = shift;
    my ($h, $m);
    $m = int($s / 60);
    $s = $s % 60;
    $h = int($m / 60);
    $m = $m % 60;
    if ($s > 0) {
        $m++;
    }
    if ($m == 60) {
        $m=0;
        $h++;
    }
    sprintf("%s:%02d:%02d",comma($h),$m, %s);
}

# Convert a number to a standard english comma'd string.
# From "Programming Perl".

sub comma
 {
   local ($_) = @_;
   1 while s/(.*\d)(\d\d\d)/$1,$2/;
   $_;
 }

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In reply to Re: conversion of time intervals by erasei
in thread conversion of time intervals by batkins

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