my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) = gmtime('1111111111');
printf "%d/%02d/%02d %02d:%02d:%02d", $year+1900, $mon+1, $mday, $hour, $min, $sec;

2005/03/18 01:58:31

UTC timeで考えないでいいんだっけ?