You've got to hand it to John McNamara. When he takes over the maintenance of a module, he goes all the way and doesn't hold back. I remember the very rudimentary documentation this module used to have under the old author. The documentation is MUCH BETTER now! The author of Spreadsheet::XLSX should take notes from John.
I'm having problems with extracting XLSX dates. The default underlying date number is useless to me. I'm sure there's a simple way to get the formatted date, but the sparse and cryptic documentation doesn't help.