When is Day 1 for filing the TDAC if I arrive on July 3?

I filled it in for the day I arrive

When u arrive

It's just another hoop that Thailand wants you to jump through whilst bemoaning the lack of tourists. KISS = Keep It Simple, Stupid. Now they're racially discriminating against foreign drivers despite doing nothing about their own drivers whose record is the 2nd WORST in the world. 14,144 deaths last year = nearly 40 every DAY! These are official figures which are not the whole truth.

Try it the last day you can before leaving. It will show available days. Or try today's date, just don't submit

Up to you, immigration wont know if you stopped somewhere or went camping.

72 hours before your flight arrival time is your 3 days

Just do it 2 days before and then you know you can do it 😂😂

Day you will land thailand

It's 72 hours from day of arrival. You know what day you land, just count back from there. You can fill it in even on day you arrive, before you pass immigration.

Count backwards from date you arrive. 1-2-3

It's 72 hrs