早于某个时间;在某时间之前
not after
She said she'd prefer us to arrive no later than nine o'clock. 她说她希望我们能在9点之前到达。
You must complete the forms as soon as possible, but no later than July 11th.
The recession should be over no later than spring.
A notice must be issued not later than 60 days before the election.
Please be in the meeting hall not later than 18:30.
See also: later adverb