90 day report timing question

[Lagavulin]

I entered Thailand on July 8th with a 90 day Non-immigrant Type O Visa which would expire on October 5th.  On September 5th, I extended my stay for one year (retirement), and my extension stamp is dated September 5, 2017.  Is my first 90 report 90 days from September 5th, or 90 days from my original visa expiration date of October 5th?

 

TIA

[ubonjoe]

Your 90 day report is due 90 days from the date you applied for the extension which would be December 3rd if you applied on the 5th of this month.

[Lagavulin]

7 minutes ago, ubonjoe said:

Your 90 day report is due 90 days from the date you applied for the extension which would be December 3rd if you applied on the 5th of this month.

Thank you Joe!  Since that is a sunday, do I do the report on Friday or the following monday?

 

[ubonjoe]

You can do the report up to 15 days before or 7 days after the report date including that date in the count. It is your choice when you do it as long it is within that window.