Invalid value for attribute

Hello -

We have an attribute that populates a date. I need to have the date default to a specific date in 2014.  In the T_KEYWORD, I am plugging in a date in the custom default value to be 9/1/2014 but keep getting an invalid value error when testing adding this attribute.  Is there a specific format the date needs to be or does this need to be added someplace else?

 

Thank you

Brian

 

Invalid value