90 day reporting online.
Originally it was stated only applications between 15-7 days before due date will be accepted.
My experience is that even closer to the date, applications may be accepted. But what about afterwards, within the post 7 days period ?
TLDR : Answer Summary
The online 90-day reporting for Thai visas can be submitted from 15 days prior to the due date until the due date itself. In-person submissions have a slightly more flexible timeline, allowing for submissions from 15 days prior to 7 days after the due date. Mail submissions must be postmarked at least 15 days before the due date.