Date field in form with NA (Not Applicable) selection option?

You could create you own custom component with exactly the same interface as the default dateTimeField but implements your own logic. Last week we did something like that with a pickerField. A radioButtonField above lets the user choose to select an existing item or create a new one. For creating a new one we replace the picker by a textField.

Then copy&paste your forms SAIL code to a text editor, search/replace the component and copy&paste it back.

You could create you own custom component with exactly the same interface as the default dateTimeField but implements your own logic. Last week we did something like that with a pickerField. A radioButtonField above lets the user choose to select an existing item or create a new one. For creating a new one we replace the picker by a textField.

Then copy&paste your forms SAIL code to a text editor, search/replace the component and copy&paste it back.