repoman presently forces starting year of 1999. It should (1) handle copyright dates with only a single year, no range, (2) handle copyright dates that start in a year other than 1999. The attached patch would suffice
Created attachment 53448 [details, diff] repoman.diff
Fixed on or before 2.0.51.22-r1
Looking through the batch of bugs, I'm not sure that some of these are actually fixed in stable. Others, the requirements have possibly changed after the initial fix was committed. If you think this bug has been closed incorrectly, please reopen or ask that it be reopened.