I want to use 'due date' in the following sentence:

They learn how to solve their problems in the due date.

I doubt that whether 'in the due date' is correct or not. Am I wrong?

closed as off-topic by FumbleFingers, Wrzlprmft, choster, Janus Bahs Jacquet, Hot Licks Sep 17 '17 at 19:06

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They learn how to solve their problems by the due date.

Should this question be on ELL SE?

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