OK,
thank you for your answer.
it works like that, but it’s too bad, and for me it’s a kind of bug which need to be fixed.
If I want to display the event till the end of it, I need to cheat with the start time. In that case, the event start / end time information do not mean anything to the readers.
I use also the event widget from Modern Tribe. The widget works fine (in a different way than your plugin)
Anyway, all these issues could be fixed by using the end date time as mentionned in my first email
regards