sentence: time zones the keeping of standard time is divided into three time zone : western indonesian time/wit ( indonesian : waktu indonesia barat / wib ) ( utc+7 ) wib is observed in islands of sumatra , java , provinces of west kalimantan and central kalimantan central indonesian time/cit ( waktu indonesia tengah / wita ) ( utc+8 ) wita is observed in islands of sulawesi , bali , provinces of east nusa tenggara , west nusa tenggara , east kalimantan and south kalimantan eastern indonesian time/eit ( waktu indonesia timur / wit ) ( utc+9 ) .