Your bug report

#34608: date +%+4C is unimplemented, contrary to POSIX

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 34608@debbugs.gnu.org.

-- 
34608: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=34608
GNU Bug Tracking System
Contact help-debbugs@gnu.org with problems