You should use the date on your final degree certificate, 9th February 2024.

This is the official date of completion of your degree and the best representation of your qualification.

Whereas the earlier dates may be connected with the examination or provisional certificate, a final degree certificate is the ultimate confirmatory document that confirms your qualification.

For that reason, you must use the date on your final degree certificate, which was February 9th, 2024, for filling any official forms or applications.