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Does anyone know how to add the account name or company name into the task layout?

Thanks in advance!

I am having problem calculating the age on a custom object.

This is my formula:

IF({!Fulfillment_Completion_Date__c}, ROUND ({!Fulfillment_Completion_Date__c} - {!CreatedDate} , 0) ,
ROUND(( TODAY() - {!CreatedDate}),0))

Here is the error I am getting:

Error: Incorrect parameter for function -. Expected Number, Date, received DateTime

Can anyone help me fix this?

Thanks in advance,

Julie