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Then        Now                  Date::Calc   BaldPenguin
----------  -------------------  -----------  -----------
2005/08/01  2006/10/29 00:59:00  454          453.9993056 <- XXX
2005/08/01  2006/10/29 02:01:00  454          454.0840278 <- ok

use strict;
use warnings;
...
      );
   }
}