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Have you tried:

grep -o '[0-9]\{8\}' input.txt

-Rob.

At first I didn't notice his request to reverse mm and dd from the input file, so your approach is most likely best as cut can't reorder fields like awk can. But you'll need to change your code to:
...

You may try this:

cut -c 1-6,9- input.csv |cut -d, -f 1,10|tr ',' '\t'-Rob.