In landscape mode the date and time selectors should be side by side, rather than top to bottom.

In Landscape view there is not enough room to scroll the time wheel.  When the limit of the white window is touched, everything disappears without change.

On my iPad, even in Portrait mode, it is not enough to change the time and close the window.  This will not result in a time change.  The time change will only validate if you pause for a moment and wait for the written text to change.  „Planned Dep: xxxxx“