Welcome sab72, please read into some other threads ...
Text file to Tag - Problem
Text File to Tag Conversion Tips
... and more ...
https://community.mp3tag.de/search?q=text%20file%20to%20tag
... then come back to ask for more.
Make sure that the format string exactly reproduces the structure of the data line from the input file.
DD.20110816.1903.CEST