Hi LDWill,

       As per my knowledge with SharePoint 2010,  ListItem doesn't allow empty or null datetime. But there is a workaround for this, you can pass minimum Date value i.e. 01/01/0001 while your date is empty.

 Sharepoint consider 01/01/0001 as minimum date value . In your form  use inline function to check datetime if it is empty then replace it with minimum Date  value i.e. 01/01/0001 else pass actual date.

And while you are displaing datetime on Smartform control  again use inline control to convert 01/01/0001 back to empty value. 

Kran,

thanks for the answer. It looks like a good workaround.

Can you explain me the last part of it?

And while you are displaing datetime on Smartform control  again use inline control to convert 01/01/0001 back to empty value. 

Thanks,

Will

Hi LDWill,

                I mean to say, In case you want to display date field on form  then by default it will appear as 01/01/0001, so to avoid it from displaing as  wrongly, you need to replace back this with Empty string as we are considering Empty date  as 01/01/0001  while adding data to SPList item.

during form initlization  you can add rule to do this.