[libreoffice-users] style per sheet for different types of numbers

Good morning
I am using LibreOffice 5.2.2.2 on Windows 10 / 7 / Linux Mint
I do have a file with about 20 sheets, containing patient data - using 
both English and Japanese.
Naturally there are ordinary numbers like age (50 etc.), but there are 
also dates like first visit etc.
I would like to apply the same style to every sheet.
Meaning:
Japanese font = xxx / size = xxx
English font = xxx / size = xxx
I think I managed to set that up in my cell style "clinic".
However, numbers I can set ONLY to "Date", in which case "50" suddenly 
turns into some incomprehensible figure,
or to "Numbers", in which case then the date is converted into a number 
that does not make any sense to me (although by now I know, there is a 
rationale behind that number).

Is there a way to set up a cell style (page styles do not have any 
settings for numbers, fonts etc.) that can handle BOTH standard numbers 
and dates?
Or do I have to format every single column in every single sheet by hand?

Thank you for your help.
Thomas

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