帮忙看一下这两句话的意思上的区别.

问题描述:

帮忙看一下这两句话的意思上的区别.
Documents must be presented to the bank after 15 days after shipment date
Documents must be presented to the bank within 15 days from the shipment date

第一个是
发货日期15天以后即可
第二个是
从发货日期算15天之内