mozilla-b2g/gaia — pull request #9558 by evanxd (2013-05-04 16:02:01+00:00)
Title: Bug 868762 - [Settings] Cannot set the system time as 12:xx PM in the Date & Time panel.

The hour value of time is between 0 to 23 in HTML spec.

http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#valid-time-string

http://bugzil.la/868762