I'm going to China on May 1, 2008, and my visa expires on '10MAY2008'. Can I still stay for 30 days? Can I extend my stay in China while I am there?

China Visa FAQ by FreeChinaVisa.org

Yes, you can. As long as you enter China on or before the expiration date, you can stay for 30 or more days as specified on your visa. The duration of stay starts from the day you enter China.

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