Fix bad value for time element #2788
Pull request description
validator.W3.org reports this error:
When you add a blog post in the backend, the publish_on field (time) can be entered as "hh:mm" Seconds are not allowed here!
So all datetime stamps for the publish_on column in the blog table look like this:
So, why should we bother to print milliseconds when these are always set to zero???