--- /dev/null
+--- version.texi.temp 2023-01-27 22:01:14.684324013 +0900
++++ version.texi 2023-01-23 10:35:55.080798476 +0900
+@@ -1,4 +1,5 @@
+-@set UPDATED 20 March 2015
++@c @set UPDATED 20 March 2015
++@set UPDATED 2015-03-20
+ @set UPDATED-MONTH March 2015
+ @set EDITION 2.21
+ @set VERSION 2.21