Serious bugs

I can’t publish events, the status stays unchanged. When I try to view an event it shows me the 404 page.

Furthermore, when I try to save an event without a start time and end time (for an event that lasts all day) I get a 503 error and then a bunch of errors that are all saying “Please make sure even time is validate” (sic)

Also, when I try to input the date, all future dates are unavailable, until I remove the (automatically filled out) end date first.