my $x = timespan2seconds('1 20:19:33');
print "$x\n";
my $y = timespan2seconds('20h 33s 1d 19m');
print "$y\n";

$x -= timespan2seconds('2d');
$x -= timespan2seconds('34s');
$x -= timespan2seconds('20:19');
$x += timespan2seconds('1d1s');
print "$x\n";

$y += timespan2seconds('4h');
$y -= timespan2seconds('0:19:33');
$y -= timespan2seconds('2d');
print "$y\n";