Simple/Elegant way to determine uptime on XP

This has been eluding me for a while... I've tried "net stats srv", WBEM, uptime.exe from M$ all of them sucking for use as CGIs under Xitami/WinXP.

Then I learned this trick on a Perl forum:

<?php
$DAY = 3600 * 24;

$stat = stat('c:\WINDOWS\bootstat.dat');
$mtime = $stat['mtime'];

$dT = time() - $mtime;

$d = intval($dT / $DAY); $dT -= $d * $DAY;
$h = intval($dT / 3600); $dT -= $h * 3600;
$m = intval($dT / 60);   $dT -= $m * 60;
$s = $dT;

$pl = "s"; if($d == 1) { $pl = ""; }
printf("up %d day%s %d:%02d:%02d\n", $d,$pl, $h,$m,$s);
?>

-ulianov