先看一个例句：

The Issuer shall, not later than 10.30 a.m. (London time) on the Business Day immediately preceding each date on which any payment in respect of the Bonds becomes due, transfer or procure to be transferred in the manner provided for in Clause 2.3 to the Principal Paying Agent or to its order such amount as may be required for the purposes of such payment.

1译文

发行人应在各与债券有关的任何款项到期之日前一个营业日不晚于上午10:30（伦敦时间），以第2.3条规定的方式，将实现该付款目的所需的金额向主要付款代理或按其指令转账或安排他人向主要付款代理或按其指令转账。

2分析

not later than≠before，not later than意思是不晚于，不晚于10：30，也包括10:30，但是before意思是早于，早于10:30则不包括10:30