Time code format and words not accepted (General)
Try with %I:%M %p or simply %r (check http://php.net/strftime or `date' manpage)
Thanks xoan for showing me this replacement code. It works. (I checked http://php.net before asked question but didn't see the link you show. Stupid me)
I don't use spam protection, but if it works as you say, seems that it's a bug.
I hope someone can fix this bug.