Indonesia has three time zones — Western Indonesia Time which is GMT +7 (covering Sumatra, Java, Madura, West Kalimantan, Central Kalimantan), Central Indonesia Time which is GMT +8 (covering East and South Kalimantan, Sulawesi, Bali, Nusa Tenggara) and the last is Eastern Indonesia Time which is GMT +9 (covering Maluku and Irian Jaya). The capital Jakarta is GMT + 7 or 16 hours ahead of US Pacific Standard Time.
Office hours start from 8 AM to 4 PM, or 9 AM to 5 PM. Lunch break occurs between 12 noon to 1 PM.Usually offices are closed on Saturdays, including government offices. Government office hours start at 8 AM and end at 4 PM.
Standard banking hours are from 8 AM to 3 PM from Monday to Friday. However several banks open their branches in hotels (and some in malls) longer than office hour, a few are open on Saturdays so you might want to check first. Jakarta has a number of international banks, even though you can also exchange currencies in some hotel cashiers and official money changers.
The Indonesia Rupiah is also called IDR. Information of daily exchange rate can be found in newspapers or from the net. Some Indonesia banks provide this on their websites. IDR and US$ are the most acceptable currencies. Most tourism resorts have money changer facilities. When you are traveling to remote areas it is advisable to exchange your money and clear your check. Credit cards are only acceptable in big hotels, restaurants, shops and traveling agencies.
Electric power supply is 220 volts in all regions. So be careful with your 110-volt electronic equipment. The sockets will only fit with with two pins rounded-tip plugs (technically known as Type C, E, and F) or use adaptors. Most hotels and many restaurants in large cities provide internet connections or free WiFi.