action assign a birtdate

That should work when you make it {{yourvalue}} vs {{{yourvalue}}}

regardless if I put in {{{$Model.Get_CR_Lead_Person.data.0.Birthday__c}}} or {{$Model.Get_CR_Lead_Person.data.0.Birthday__c}} when I save the model and then open the model it has today’s date.

I’d use Skuid.model.map(); in the console to determine what exactly is given at $Model.Get_CR_Lead_Person.data.0.Birthday__c