I had created an issue on Github, but before i have to unfortunately give up on this tool i thought i would ask here.
When using import_logs.py, both IIS and Apache (maybe all) logs are imported as data from today (or whenever the script runs) and the date in the logs is ignored. The Github issue is here: Imported Using Todays Date · Issue #130 · matomo-org/piwik-log-analytics · GitHub
As far as I am aware running this Python script is all that is needed for the logs to be processed to the DB using the date in the logs? If that is the case i will certainly have a look at the script and see if i can pinpoint the issue