Thailand Visa expires on the "admit until" date or the day after?

I'm currently on holiday in Thailand and I have a 30 day visa. The visa stamp says "admit until April 12, 2009". Is this the last day the visa is good through, or is the visa invalid on this date?

I ask because that day is today and I want to do a visa run if it's still valid. If it's invalid though, a visa run would be kinda redundant. :/

Yes it is good to the 12. Aways good to wait to the last minute to figure this stuff out. Have fun on your visa run, and remember you will only get 15 days when you return to Thailand.

You could've gone to the Immigration Bureau and extended your stay until you get your itinerary in order. It only cost 1500THB as of last year.

I don't mean to scare you but overstays in Thai is not something you want to experience if the Thai cops catch you. However, if you're in the airport you will have to pay a penalty 500THB per day without jail. Unless you can't pay.

April 12, 2009 is your last day you can stay in Thailand and you must be out before that date. If not, you are on an overstay status and could be fined.

The last day to stay in Thailand is April 12, 2009.

sounds like on Apr.13 you are on overstay.