@Daniel *************
My friend, you are incorrect 90 day is a reporting period and not (as you state) an extension. The poster clearly states 90 day report. Perhaps you are talking about something different. I have a Marriage Visa (actually7 an incorrect term but everyone recognizes it) which expires in Feb 2019. My 90 day reporting was due on 15 Jul 2018. But my wife and I went to Australia for the period 30 Apr to 1 Jun 2018. My 90 day reporting commenced again when I returned to Thailand and is based on my arrival date as shown on my (now) used re-entry permit. I did my 90 day report at Immigration at Promanada yesterday receiving a stamp to report again on 17 Nov 2018. If you were correct, I would have been overdue for my 90 day report by well over 1 month. I am correct based on my own current experience.