More flexibility with dates

[tycecycle]

given More Flexible Date FIeld has such a similar name but is unique (I don’t think either issue depends on the other), seems like this thread could be renamed, possibly split, into something like “more options for date/date time recurring entities configuration” and “optional end date” with Show entities with no end date on timeline merged into new optional end date issue (maybe not totally clear that would make sense). the other requests in this issue, make optional setting specific time and show all on single calendar view would be handled by More Flexible Date FIeld I think