Perhaps useful to you. All hail Time::Duration.
my ( $uptime ) = (
IO::File->new('/proc/uptime') or die "No! Can't open!: $!\n"
)->getline =~ /^ (\d[\d.]+) \s+ (\d[\d.]+)$/x or die "Invalid uptime!\
my $now = Time::Piece->new;
my $boot = $now-$uptime;
printf <<"EOF", duration($uptime), $boot->cdate, $now->cdate;
-- Iain, aka Koschei.
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