Work around a ridiculous bug in FreeBSD date(1).

[root@build3]# date -u '+%Y%m%d%k%M'
20141202 017
[root@build3]# date '+%Y%m%d%k%M'
201412011617

See that space?  It only happens if you are formatting in GMT and the hour
is past midnight.  I'll go look at strftime(3) later to see if the bug is
there, but for now work around it.