I stay just 2weeks using tourist visa now. and May I ask you some questions?

Can I get reentry permit after I got extension 1 month of tourist visa?

or

Can I get extension of tourist visa for 1 month, after I come back from outside thailand?

and

Can I ask you about reentry permit periods?

Must I fill in exact going out and coming into day from outside thailand in immigration office?

and if so, after go out thailand, and I changed the return day, so what should I do?

Please teach me , thank you!

You have not told us what passport you are using.

Did you really obtain a tourist visa from a Royal Thai Consulate? Or did you arrive in Thailand and buy a visa on arrival?

You have not told us what passport you are using.

Did you really obtain a tourist visa from a Royal Thai Consulate? Or did you arrive in Thailand and buy a visa on arrival?

I got tourist visa in counsalate in penang, until now just 2 weeks from entering thailand.

OK guess I am on the same page now. You have a two month tourist visa entry which you have only stayed here for two weeks. You want to know about re entry permits.

A re entry permit allows you to exit Thailand and return to use the remainder of your current permitted to stay stamp. It is not usually used with tourist visas as it is usually easier and less expensive to just return on a 30 day entry without visa for most nationalities.

If you obtain the re entry permit after you extend your stay for 30 days the re entry permit will allow you to return to Thailand to spend the remainder of those 30 days. Example new permitted to stay until 30 Dec and you get re entry permit and leave on 3 Dec until 10 Dec. When you enter on 10 Dec you will receive a new permitted to stay stamp to 30 Dec (your original date).

toursit visas are issued as singles and yours is a single and visa chaos reigns so answer is no.

you can leave and get restamped at border for a few months perhaps OR...

try your luck again at a emb\consulate