I’m sorry you are having a problem with the date on your files. By “the Get Info button,” are you referring to the “i” button in the RAW Power standalone editing interface? If you are using 2.0 standalone app, there are two places where the date appears. One is in Info and one is the “i” button when you click Edit. There is no Info for the Photos extension, as it uses the one in Photos itself (Cmd-I).
Do you see the wrong date in both Info and in the “i” button? The dates look right in the tests I have run — perhaps there is something special about your files. Would you mind emailing a RAW with the problem (firstname.lastname@example.org)?