Tony the difficult part is we HAVE to know some EXACT marker to look for, otherwise very difficult to help you.

In your example, will EVERY logfile have the exact same word Day
followed by a TAB or will Day
possibly be elsewhere or a different name ?

I'm right in the middle of getting ready to rebuild my machine and I'm archiving off about 1/2TB so my system is a bit slow for doing much right now.

Would love to help but we do need some EXACT details otherwise the text data part will be impossible to do.