I want to ask about the meaning of a sentence. What does it mean?
If it's not the due date, it's not a do date.
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A "due date" is the date when something is due. The date that something must be finished, or is expected to finish.
The report is due on the 20th January. = The project's due date is the the 20th of January.
The use of "do date" is a joke. This is not an idiomatic expression. It would mean "the date that I do something". So the joke is "if it isn't due today, then I don't do it today". Or "I only do things on the last day". But it is a joke, so don't take it too literally.