Using CB Auto Actions you'll need to set the field value using jQuery and a date substitution. Aside from that you can't as default values don't support substitutions so you can't supply it a date substitution. Please see the below tutorial for substitution usage information. For CB Auto Actions you'll need to use a Code action with Method set to jQuery on the before registration form trigger.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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