Paul,

SET NOTIFY OFF will turn off error message and user will stuck in the field if date is incorrect.

>I can't remember how this happens, and I'm sure I used to know.
>
>In a form, a textbox fires an "invalid date" message ONLY when run in development mode.
>When built into an executable, it just hangs infinitely when the 31st of June is entered.
>
>Yes, I know that 31/6/2004 is invalid, and so should the user (30 days have September, etc).
>But something is not triggering the message in runtime, different from development.
>SET DATE, SET SYSFORMATS, what is it?