Bug 403198: Plannerfield: Strange behavior regarding year component

https://bugs.eclipse.org/bugs/show_bug.cgi?id=403198

Applies Patch by Ken Lee with minor changes in Javadoc.
RESOLVED - bug 406813: ImapAdapter: 6 Issues 
https://bugs.eclipse.org/bugs/show_bug.cgi?id=406813

Allready in Gerrit: https://git.eclipse.org/r/#/c/12506/