Bugzilla – Bug 912
Check that fractional part of seconds are 1, 2, or 3 characters
Last modified: 2012-03-09 11:44:49 CET
http://dev.w3.org/html5/spec/common-microsyntaxes.html#valid-time-string
https://bitbucket.org/validator/syntax/changeset/732924c293a5
https://bitbucket.org/validator/syntax/changeset/944658d7e36c