jpg Exif CreateDate as prefix in filename date format fmt with colons in german

[jacky]

Hi,

when I print the data of my ram_1.jpg - file I got all the values, see attached log.txt.
The date is printed as (german layout):

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Create Date                     : 2017:10:03 11:27:27.069474
Date/Time Original              : 2017:10:03 11:27:27.069474
Modify Date                     : 2017:10:03 11:27:27.069474
I'm searching for hours now in this forum and in Google how to prefix the Exif-date into the filename and it still doesn't work.

E.g. trying

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exiftool -d "%Y%m%d-%H%M%%-03.c.%%e" "-filename<CreateDate" .results in

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Warning: [minor] Unrecognized MakerNotes - ./ram_1.jpg
    1 directories scanned
    1 image files updatedand creates a file "mHe" (without extension).

Or

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exiftool -fileOrder DateTimeOriginal -recurse -extension jpg -extension jpeg -ignoreMinorErrors "-FileName<CreateDate" -d "%Y-%m-%d%%-.3nc.%%e" .results in

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Warning: Error rebuilding maker notes (may be corrupt) - ./ram_1.jpg
    1 directories scanned
    1 image files updatedand creates a file "m-e" without extension.

Trying to set the colons in our german date FMT string

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exiftool -d "%Y:%m:%d %H:%M%g" "-filename<CreateDate" .reports

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Warning: New file name not allowed in Windows (contains ':') - ./ram_1.jpg
    1 directories scanned
    0 image files updated
    1 files weren't updated due to errors
Could you help me how to manage this date prefix into the jpg filename?

I've got so many images and this would help me a lot. 

Thanks in advance.

[jacky]

I just found a solution:
https://exiftool.org/faq.html#Q27
which was mentioned in this post:
https://stackoverflow.com/a/72407154/17058700

Now I'm using the doubled percents in the date expression

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exiftool "-FileName<FileModifyDate" "-FileName<CreateDate" -d "%%Y-%%m-%%d_%%%%f.%%%%e" .in a batch file which generates the filename "2017-10-03_ram_1.jpg" which is exactly what I wanted.

So far I'm contented