This problem is fixed with Tune-up 2.0, and we recommend installing it.
You may also try the following:
1) Reset the system clock (General cp will work for this).
2) Delete Retrospect scripts and rebuild them. You may need to delete the
entire Retrospect folder (/mac/sys/System Folder/Preferences
/Retrospect). The problem is not with Retrospect, but if Retrospect
runs subsequent to the date shift, the script files are tainted by the
wrong date.
3) You may want to resave any files with 2017 dates. Retrospect still
backs them up, but the date information is still disconcerting in the
Finder.
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