Hi all, I am so close to finishing this process automation badge but am stuck in one area in Step 7.

I've built out my process builder as follows





And my date formula as follows
 

Case(MOD(Date__c-DATE(1900,1,7),7),0,"Sunday",1,"Monday",2,"Tuesday",3,"Wednesday",4,"Thursday",5, "Friday",6,"Saturday", "")

 

Challenge Not yet complete... here's what's wrong:  The Robot Setup Day of the Week formula does not seem to be working properly. The Day of the Week should not fall on Saturday or Sunday. 

It works nicely but doesn't seem to pass, what could be up.
 

I wrote AccountsSelector class but I still can't pass the challange.
Where could I be wrong?
Code:

public with sharing class AccountsSelector extends fflib_SObjectSelector{
    
   public List<Schema.SObjectField> getSObjectFieldList() {
        return new List<Schema.SObjectField> {
            Account.Id,
            Account.Description,
            Account.Name,
            Account.AnnualRevenue };
    }
    
    List<Account> selectById(Set<ID> idSet) {
      return (List<Account>) selectSObjectsById(idSet);
    }

     public Schema.SObjectType getSObjectType() {
        return Account.sObjectType;
    }

}