date.c: fix parsing of dates in mm/dd/yy format
date.c: fix parsing of dates in mm/dd/yy format

We looked at the year one character too early, and we
didn't accept a two-character year date after 2000.

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git