Recording the fix in HUDSON-8656.

Yes, this is HUDSON-8656 and not JENKINS-8656.

changelog.html

@@ -61,6 +61,9 @@ Upcoming changes</a>
   <li class=bug>
     Unnecessary log messages if a remote pipe is not read until EOF
     (<a href="http://issues.jenkins-ci.org/browse/JENKINS-8592">issue 8592</a>)
+  <li class=bug>
+    Fixed a bug in the calendar computation.
+    (<a href="http://issues.hudson-ci.org/browse/HUDSON-8656">issue 8656 in Hudson</a>)
   <li class=rfe>
     build RSS feeds now contain description of builds.
     (<a href="http://issues.jenkins-ci.org/browse/JENKINS-3935">issue 3935</a>)