Wrong dates displaying on the front-end
It looks like now when calendar field don't have set recurrent or time period option it doesn't display any data on the front-end, however in edit page date set in this field during creation is displayed properly.
When field have enabled recurrent date option it is displayed as time period date with 'from to' text. For example, if I set 18.07.2017 recurrent weekly, on the front-end appear:
each week from Tuesday to Thursday