There are three Standard Time zones In Indonesia:
Sumatra, Java and West & Central Kalimantan are 7 hours ahead (GMT+7) of Greenwich Mean Time.
Bali, Nusa Tenggara, South & East Kalimantan and Sulawesi are 8 hours ahead (GMT+8) of Greenwich Mean Time.
Irian Jaya and Maluku are 9 hours ahead (GMT+9) of Greenwich Mean Time.
Indonesia does not operate Daylight Saving Time.
The international dialling code for Indonesia is +62.