I am planning to visit mutianyu great wall on 13 may 2016.

I heard that bus no 867 from dongzhimen bus station to mutianyu directly. but i heard from other sources that this bus has been stopped. dont know what is true . please reply when you are sure about that bus . i mean bus no 867 directly to the wall. and its timings on may 2016. please say timings if you know .. thank you.