I want to create an event with a start date and an end date but I just can't get it to work.
I keep on getting two alternative error messages (see attachments):

With start date on the following day:
"Please make sure the form is complete and valid.Invalid period: You have entered an end date, but no start date"
With start date on the same day:"Please make sure the form is complete and valid.Field required: Dates"
What am I doing wrong?
I need start date and end date, since I have the "google structured data"-component that uses these dates.

When I use the "single dates"- field, no usable date is parsed for structured data.

I would appreciate if sombody could point to a solution.
Thank you in advance