What should I know about my OA visa and entry stamp in Thailand?

Okay, you have some good and some SHIT posts on here :O

AND

you're confusing TWO completely different things

You have a year-long, multi-entry Non-Immigrant type O-A VISA that gives you a year entry stamp every time you enter during it's validity. That VISA expires on July 17th <- meaning IF you can get back into the country on or before that date you'd get a whole NEW year entry stamp

AND

You appear to have an entry stamp where you entered the last time on Jan 15th 2020 and were stamped in for a whole year until Jan 13th 2021. <- THAT is the stamp that lets you stay IN thailand.

Now just so you know, IF you're going to leave/re-enter the country AFTER the VISA itself runs out (July 17th) you would need to buy a re-entry permit before you stamp out so that when you do come back you're stamped in until the 13 of Jan 2021.

These days I would be very concerned about getting back in. Plus the quarantine issue.

One of the big advantages of getting a A-O visa from your home country! You can leave just before the visa expires and return and effectively you get almost an extra year added! Note that it’s no longer a multiple entry visa then so if you want to travel out of Thailand you will need a single or multi re entry permit (get at the airport or immigration prior).

In your case, you left in January so that’s when it’s extended to. Look in your passport!

‘Valid until’ and ‘admitted until’ are two different animals.

Valid until means ‘use before’. If you don’t use it by that date ie arrive Thailand by that date then the visa expires.

Once you get here you are allowed to stay until the date your admittance expires - in your case 13 January 2021.

VALID UNTIL has nothing to do with admitted until. You are fine until

13 Jan 2021.

If it is was possible (covid) You could enter on 17 JUL 2020 and stay another year. If you get a multiple re-entry permit come and going as you wish

Post picture of it guessing the july date was when you were supposed to enter by

That doesn't really make any sense man. Can you post a picture of the visa and entry stamp? Block out the important numbers.