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  use Time::Piece;
  $t = Time::Piece->strptime('%T', $time_string);

  $seconds = $t2 - $t1;
  print "Diff (secs): ", $seconds->seconds, "\n";

   $total_secs = $s2 + $s1;
   print "Secs: ", $total_secs->seconds, "\n";