Learn English Vocab
no later than
not earlier than
SENTENCE 1 - “The ads should be published no later than 7 AM EST on Monday”
SENTENCE 2 - “But not earlier than Monday at 12 AM EST”
In SENTENCE 1, “no later than” means that the action should be done by the specified time, and it’s okay to do it earlier.
In SENTENCE 2, the action should begin on Monday at the earliest and should
start before midnight (12 AM) Eastern Standard Time (EST).