Last modified: 2013-11-20 15:23:34 UTC
It is possible to enter time values more precise than days via the API. The UI can't handle these though and displays a unserializable error.
Change 84996 had a related patch set uploaded by Daniel Kinzler: (bug 54333) Validate time precision. https://gerrit.wikimedia.org/r/84996
Change 84996 merged by jenkins-bot: (bug 54333) Validate time precision. https://gerrit.wikimedia.org/r/84996