Shipping_date__c false IF(ISBLANK(Date_Shipped__c), DATE(VALUE(mid(Date_Returned__c,1,4)),VALUE(mid(Date_Returned__c,5,2)),VALUE(mid(Date_Returned__c,7,2))), DATE(VALUE(mid(Date_Shipped__c,1,4)),VALUE(mid(Date_Shipped__c,5,2)),VALUE(mid(Date_Shipped__c,7,2)))) BlankAsZero 发货日 false false Date