When the date is picked it somehow jumps to this month. When the month is manually entered the date picker does not jump to the month September and the data won’t get submitted, when pressing Submit, with september manually entered the payload of the post sends an empty string:
Might be possible the Date Time Picker | Components | Vaadin Docs works fine, but the autocrud, autogrid and autofrom datetime pickers do not. De backing field is LocalDateTime, so no need for timezones