According to this downstream bug report:
https://bugzilla.redhat.com/show_bug.cgi?id=657588
Whitespace in the abbreviated months can cause problems reading dates
with strptime with a pattern such as %Y %b %d. The space after the %Y
will match any number of spaces in the input string. Thus there's no
space left in the input string to match the space at the start of the
abbreviated month.
This patch fixes the zh_CN locale. I have not audited other locales
to see if they suffer from the same problem.
We've been running with this patch in Fedora since Feb 2012.
OK for the trunk, or shall we wait until post glibc-2.17?