Custom Attribute (date of birth)

Custom Attribute (date of birth)

Hi there,
 
I need to ask how to allow users to enter their date of birth using the Self Service application.
 
I have extended the AD schema and the attribute (dateofbirth) field is in the 'generaltime' format.
 
I am able to add the custom attribute (dateofbirth) on the self service layout for the user, but I am just no sure on the setting to use to get a date field into AD without getting the error : error code - 8007200b: administer credentials in .......
 
Please help?
 
kind regards
Steve

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