Sorry for my late reply, I was off for some days.

ad 1. - I did not know that the date/time format in UNA is depending on the site lang locale. 

• austrian/german time format is 24 hours and it should be 24h for events taking place in this area, regardless of the language settings of a user
• as example eventim.de and many other multilingual sites

ad 2. -  Sorry for not beeing precise enough, I try again

• I would like the possibility to set date/time format for each event as the owner of the event likes to set
• 24h or 12h
• lang locale should not override the  default settings of a single event