Time: the whole of China has the same time zone: GMT+8 hours.
Language: the official language is Mandarin Chinese, local people speak Guilin dialect.
Currency: Renminbi (RMB), also known as Yuan (Y) or Kwai.
Notes issued: 500 RMB, 100 RMB, 50 RMB, 10 RMB, 5 RMB, 2 RMB.
1 RMB. 5 jiao, 2 jiao, 1 jiao.
Coins issued: 1 RMB, 5 jiao, 1 jiao 5 fen, 2 fen, 1 fen.
Please kindly be noted that 5 jiao and 5 Yuan are difficult to tell apart.
Banking Hours: Monday to Friday, 9.00am-5.00pm.
Telephone: the international dialing code for China is 86. Guilin's local telephone code is 0773. Making international calls from China, first dial 00 + country code + area code + telephone number.
When to go: best time to visit Guilin is Autumn or Spring
Tourist Season: From March to November
Coldest Months: January and February with temperature as low as 3C
Hottest Months: July and August with temperature as high as 36C
Annual Precipitation: 1,900 millimeters (mainly in May through September)
National Holidays:
China observes 3 main holidays. They are the spring festival or Chinese New Year (which normally falls in Jan or Feb), the Labor day holiday (may 1 to may 7) and the national day holiday (Oct 1 to Oct 7). These are the golden holiday weeks in China.

You can see more information for Guilin Festivals.