So one of my testers found that they can enter the word hello in a date field. Is there a setting I should be selecting here that I possibly have not yet discovered?
If the data type on the field is set to Date, they will get a validation error.
So I think the solution was that in my database, the field was set as date instead of datetime. FYI for all you other Infopathers.
HIllary, thanks for helping me consider the obvious, which is often the last thing I consider!