Error: String was not recognized as a valid DateTime. When going through an event registration form.

When using a BBIS event registration form that has a date format, that is not required to fill out, if you don't fill it out it produces error: String was not recognized as a valid DateTime.
We are currently evaluating this issue for a fix in a future service pack.

Workaround: In the form configuration, mark the attribute as required.

Steps to Duplicate

1. Register for an event
2. Do not add a date
3. Error: String was not recognized as a valid Date Time. 

Environment

 Blackbaud Internet Solutions
 4.0
 4.0.178

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