If you are looking for the automated solution, then it would not be possible, as you will need to track that manually.
You can create a separate column in the gradebook worth 5 points, and mark it to be an extra credit.
Also, if your installation allows grades to go over 100%, you can later override grades for that assignment in the gradebook interface, and type, e.g. not 100, but 105 instead for an individual student.
Giving extra points for turning in assignments in early
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