files into a buffer in Change Log Mode, preserving the date ordering
of entries with either the current or old-style date formats.
+@findex change-log-redate
+@cindex converting change log date style
+ Versions of Emacs before 20.1 used a format for the time of the change
+log entry that was different from what it uses now:
+
+@smallexample
+Fri May 25 11:23:23 1993 Richard Stallman <rms@@gnu.org>
+@end smallexample
+
+@noindent
+The @kbd{M-x change-log-redate} command converts all the old-style date
+entries in the change log file visited in the current buffer to the new
+format, so that all entries are kept in unified format. This is handy
+when the entries are contributed by many different people some of whom
+still use old versions of Emacs.
+
Version control systems are another way to keep track of changes in your
program and keep a change log. @xref{Log Buffer}.