[Dx4win] How to clean "Upload Date" field?

[Mike Bondarev]

Hello, fellows!
How can I clean "Upload Date" field for LoTW? An ADIF file was created
some time ago (just for testing) and I was so stupid  to save  changes.
If I'll do it manually for each QSO, it will take too much time!

Regards, Mike RL3BM