I guess what your examiner is saying is that in the past somebody should have signed you off till the 23th of September rather than the 24th, and he/she sees it as his/her job to correct that.
Seems pedantic to me, but since it is only a single day (and one you possibly shouldn't have been given in the first place) I wouldn't lose any sleep over it.
ours is just to pay up and be grateful in these matters
If your examiner charges you to sign you off by experience, find yourself another examiner.