A mistake people make (especially students) is when they assume that “due date” and “do date” are one and the same.
The “do date” is every day from the time you find out about a project or assignment and the time you complete it. Spacing out the work over multiple 15-25-50 minute work sessions over several days helps create better results.
The “due date” should be the day you submit the work (and it’s even better if you submit it prior to that date).
On the due date, you should never even think about asking for an extension, because it shows a lack of preparation and planning.
You also shouldn’t wait until the due date to do work on what is due.
If you need an extension on a due date, show people the work you’ve done so far, and ask for an extension at least 3-7 days beforehand.