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Hello. A friend asked me the difference between "no later than" and "not later than." I told her I thought they were the same. What do others think?
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I will just try generating some examples to look for patterns:

You need to be here no later than 9 to catch the bus.

You can stay up no later than 9.
these two seem to be using an idiom about times when things might be predicted to happen

He was not later than me!
is the standard way of negating a declarative sentence ..

dunno if that works?
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As Suzi has illustrated above, "no later than" is used when you need an adverb telling when something happens or when something must happen. "not" is used just to make a sentence as a whole negative. You are later than John. > You are not later than John.

CJ
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Thank you! Your explanation was very helpful.
 CalifJim's reply was promoted to an answer.
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