Look at the data ... XSLX is a Zip-compressed XML file, if I recall correctly. Don't try to guess by "looking through a glass, darkly." Go to the actual source and see what is actually there. It's quite likely that what Excel put there is its internal representation of a date, which would be "days since some epoch."

In reply to Re: Spreadsheet::XLSX date format problem by Anonymous Monk
in thread Spreadsheet::XLSX date format problem by Anonymous Monk

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