not later than

基本解释

An employee required to submit such a statement shall submit it not later than
须提交此类声明的雇员应在不迟于下述时间规定内提交声明
We make you the offer subject to your apply reaching us not later than noon December 23.
我方接受以你方答复为准的报盘，但需不迟于12月23日中午到达。
IN GENERAL- Not later than 18 months after the date of the enactment of this Act, the Commission shall promulgate under section 553 of title 5, United States Code, rules that
一般规定——在本法颁布之日后不迟于18个月内，联邦贸易委员会应当根据《美利坚合众国法典》第5编第553节的规定颁布规定下列内容的规则

As he later described it, the plane was not much more than half a kilometer above the trees.

Employers should implement the new payroll tax rate as soon as possible in 2012 but not later than Jan. 31, 2012.
FORBES: Payroll Tax Cut Skips Some Of The 99%
On this day, Julius Caesar allegedly met a seer who claimed that harm would come to him not later than the Ides of March.
FORBES: Recordkeeping and Tax Time
Countries were also requested to review their policies relating to the professional teachers in the shortest possible time and not later than the end of 2013.
UNESCO: Education