Updating the #Copyright YEAR has no legal bearing as Copyright protection is a fixed duration.
- Author-owned works is lifetime of author + 50 years (70 or longer in some countries) - Entity-owned & pseudonym (not revealed) is 95 years from FIRST publication - Unpublished is 120 years from first creation
Which means that it is pointless to list multiple years or a range of years. This is according to the International agreements related to Copyright, like the Berne Convention and the TRIPS Agreement.