Eric Blake wrote:
date -d 0001-01-01 +.%+4C.should produce ".+000.", but currently it produces ".%+4C." because the + flag is unimplemented. See also http://austingroupbugs.net/view.php?id=1184
Surely this bug should be reported against strftime, not against 'date'. POSIX does require that strftime behave that way, but it does not place a similar requirement on 'date'.