information regarding our passports

My wife and I are booked with xian Marco Polo international travel service co. ltd arriving April 23 to may 3 2015.visiting Beijing , xian chongqing Yichang and shanghai. are our passports good for this trip as they expire dec 15 2015. we were told they were good but want to make sure as we have booked our trip using our current passport numbers.we have a invitation letter from our guide service.

thank you

William r Clark
Helen m Clark