fix: end datetime can't be before begin datetime.
Add a min-datetime to endsOn and a max-datetime to beginsOn. Add maxDatetime and minDatetime props to or custom datetime-picker component. Use those new props inside date-picker and time-picker components to set a correct range of date for both endsOn and beginsOn event elements.
See issue: #308 (closed).
Closes #308 (closed)