I arrived on the June 24th on a Single Entry Visa, so that means it's good for 2 months and then I can extend for 30 days at an Immigration Office, yes?

However I was looking at my passport and the Visa was stamped as May 24th even though I arrived June 24th. Could this be a problem?

Edited July 8, 201213 yr by r1701

It appears to me, the visa was issued May 24th, and you have make an entry before September 20th, you did. Each entry is good for 60 days, so go apply for an exension before August 22nd. You can go a few days early and the 30 days will be added to the current permission to stay, you won't lose any days.

As said go a few days early and get an extension of 30 days starting from 22 August.

1,900 Baht fee.

It was issued on June 21st so maybe the guy at the airport immigration screwed up.

But thanks for the info.

Yes he had his "USED" stamp set for the wrong month. As your entry stamp is what matters it will not be a problem.

Agree with Lopburi it was stamped wrongly, a friend had similar a few years ago. They are only interested in your entry stamp and permitted to stay date, it won't be a problem at all.

I had the same problem, stamped USED 31 DEC 2011, at the day I come 02 JAN 2012.

No problem.