Do we support such input ?
That I cannot answer. Based on Time documentation, where it's said "The usage of 24h or 12AM/PM format is(...)" I would say yes. Otherwise, If not, I don't know how would we refer to midnight and noon. Roland Benedetti, can you please give us some input on this?
what is the error message in such case ?
"Time do not have a valid input". See image in attach
does the "use seconds" option have an impact on that issue ?
No. Having "12:00:00 AM" the validation fails.
does the "required" option have an impact on that issue
hmm. Yes it has. Having the "required" option, the validation passes and publishing is already possible.