Sharing TM30 updates at ChiangMai...
Went in this morning and was told now need Report within 24hrs (used to be able Report within 1-3wks if it’s NOT 1st time!)
If enter on Sat, Sunday or PH, still need Report within 24hrs, the office open on these days for TM30 but need go to 1st floor instead of 3rd floor which for Mon-Friday reporting. Hope this helps
TLDR : Answer Summary
Recent updates on TM30 reporting requirements in Chiang Mai indicate that reports must now be submitted within 24 hours of arrival. This applies even if you arrive on a weekend or public holiday, as the immigration office will be open for TM30 reporting during these times, specifically on the 1st floor of the office. Additionally, visitors' reports must also comply with this new 24-hour rule. For those unable to report in person, sending documents by post from the airport remains an option, assuming the post office is open to stamp it with the current date.