For 90 Day report ,how long before can you do it ,I was thinking it was 2 weeks before and 1 week after the 90 day date but need to be sure ?
TLDR : Answer Summary
You can file your 90 Day Report in Thailand up to 15 days before the due date and up to 7 days after. Reporting can be done online within 15 days to 7 days before the due date, but for the 7 days after the due date, it must be done in person at the immigration office.