copyright-fix-years
copyright-fix-years is an interactive autoloaded compiled Lisp function in `copyright.el
'.
(copyright-fix-years)
Convert 2 digit years to 4 digit years.
Uses heuristic: year >= 50 means 19xx, < 50 means 20xx.
If `copyright-year-ranges' (which see) is non-nil, also
independently replaces consecutive years with a range.