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Add 55 date style to recognized styles list #124

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@Cellane Cellane commented Oct 24, 2023

I encountered today a workbook file that was impossible to read with xlsxir due to containing the number format 55.

After consulting https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.spreadsheet.numberingformat?view=openxml-2.8.1, it seems that the format represents a date, and is related to Japanese dates only, which perfectly matches the expectations I had from this workbook file (Japanese client; not reproducible after opening and re-saving the workbook with Microsoft Excel on my local computer).

Ref: https://hexdocs.pm/xlsxir/number_styles.html#content
Ref: https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.spreadsheet.numberingformat?view=openxml-2.8.1

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