Update copyright.

lib/getdate.y

@@ -1,6 +1,6 @@
 %{
 /* Parse a string into an internal time stamp.
-   Copyright 1999 Free Software Foundation, Inc.
+   Copyright 1999, 2000 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by