What date should I enter for the 90-day reporting in Thailand: my arrival date or my extension date?

The question concerns which date to enter for the 90-day reporting in Thailand: the date of arrival back in Thailand on March 28, 2023, or the date of the one-year extension granted on July 7, 2023. Responses suggest that the correct date to enter is the last entry date into Thailand through passport control, not the extension date. There is also discussion around whether the first 90-day report must be done in person or if it can be completed online, with conflicting experiences shared among commenters.