Time: all of China in the same time zone: GMT+8 hours.
Language: In China, Mandarin is an official language of China. Most Chinese speak Mandarin to outsiders. So, if a foreign tourist wants to visit China but cannot speak Mandarin, they should expect to run into some inconveniences on their trip. Therefore, it is essential and useful for the foreign tourists to learn some simple Mandarin when they decide to visit China. Guidebooks like Lonely Planet or the Rough Guide have a section in the back covering the most essential tourist Mandarin.
Clothing: casual clothes are acceptable everywhere, but revealing clothes should be avoided.
Banking Hours: Monday to Friday, 9.00am-5.00pm. Although many branches also conduct limited business on weekends.
Tipping: Tipping isn't required or usually expected in China, although it is becoming more frequent within international tourist hotels and restaurants. A decent tip for porters and hotel staff is 5-10 RMB.
Telephone: The international telephone country code for China is 86. Beijing's local area telephone code is 10. When making international calls from China, first dial 00 + country code + area code + telephone number.
Electricity: 220/240 V AC, 50Hz. Either flat or square, two-pin and three pin-plugs are used. You may want to bring a universal adapter with you as they are sometimes difficult to find in China.