What are the rules for 90-day reporting in Thailand regarding attendance dates and requirements?

In Thailand, for the 90-day reporting, you have leeway when attending your appointment. You can report at the local immigration office from 15 days before your due date to 7 days after. For online reporting, the window is from 15 days before until the due date. If reporting by mail, it must be postmarked at least 15 days prior. Required documents vary by office, but commonly include your passport, the last report slip, and TM30 receipt. Online reporting is available if you're within the specified window.