Meaning of "by Sunday"

English as a Second Language English Vocabulary, Grammar and Idioms
1

Dear teachers,

Please read:

I should have finished the book by Sunday.

  1. What does “by” mean?
    2.What is the meaning of “by Sunday”?

Thanks
Quoc

2

Hi,

By has the notion of not later than or before. By Sunday means not later than/before Sunday.

Alan