小白兔，你这个理解是不对的

Receipt在英文里不单单是“收条"的意思：

Receipt的意思是：
1. a. The act of receiving: We are in receipt of your letter. b. The fact of being or having been received

3. A written acknowledgment that a specified article, sum of money, or shipment of merchandise has been received.

你所理解的是它的第三条意思。实际上从上下文看USCIS说的receipt date就是它的第一条意思，即 "receiving date"，也就是实际收到485的日期 -- 485收条上的"Receive Date"，这也符合USCIS所说的处理数据录入的延迟不会影响任何因此导致的benefit的精神，其中应该包括180 days clock to change job.