Dear Hajo,
Write Cell (Date) and Format Cell/Area (custom) now work well.
The only remark is that it forces the font to Calibri 11 (that is the default font of Excel on XLSX), but it has almost no effect on the design.
I have seen that all other cells don't have any font. Is it possible to set a default font for the file?
It could go to a new tag.
Regards,
Daniel