I want to have format as MM/DD/YYYY HH:MM. If I put that into Display Pattern, it complains about invalid pattern, it accepts 'date{MM/DD/YYYY} time{HH:MM}'. But then displays nothing in the Preview.
Well, if I change to Textfield, everything displays, but now the validation no longer works, and it does not actually accept any changes when I tab out.
Create a textfield, data format is plain text, type is 'Calculated, user can override'. In 'Calculated' event, place string to set rawValue, e.g. MM/DD/YY hh:mm. In 'Exit' event, parse the date, and the time separately, and check the format manually.