demi for demie = an error. Really!
pour onze heures trente also accepted
pour onze heures et demie
Why est prévu à not est prévu pour ? Any help welcome please
Why not onze heures trente, nothing says whether this is am or pm.
It would either be: Onze heures plus trente, or: Douze heures moins trente.
However that is very confusing and not really said I believe, hence just saying half.
Also I believe am and pm isn't very typical in French, as most use a 24h clock.