When is the best time to submit a 90-day online check-in for a Non-O retirement visa in Thailand?

The user inquired about the timing for submitting their 90-day check-in online, specifically whether it needed to be done 15 days in advance or if they can still submit it before the due date of the 12th. Comments indicated that for initial 90-day reports upon entry to Thailand, submission must be done in person. If the user has already obtained a 12-month extension, they should check their passport for the correct reporting date. For subsequent reports, it can be done online as close as 7 days before the due date.