How can I fill in my arrival day on the TDAC if I can't enter it early?

@Andy ******

It does not say submit at least 3 days before, so your entire premise is incorrect. And since the system does not allow you to select a date greater than 3 days away, it's obviously not intended.

They want where you'll be staying and when you will be arriving to be accurate, not something you planned 3 months ago then changed in the meantime and never went back and updated it.

In Thailand it is the norm, that new things are not publiced in detail until the last moment, before it comes into force.

So forget about doing anything in advance.

@Paul ***********

The calendar to choose your arrival date does not give you an option further than 3 days out. You can choose 0, 1, 2, or 3 days away for your arrival date. No it cannot be saved. It's like 4 questions.