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Time Zone
Indonesia uses three time zones which are :

  1. Waktu Indonesia Bagian Barat (WIB) :
    • West Indonesia Time is officially known in Indonesia as Waktu Indonesia Bagian Barat (WIB). Waktu Indonesia Bagian Barat is UTC/GMT +7 hours.

  2. Waktu Indonesia Bagian Tengah (WITA) :
    • Central Indonesia Time is officially known in Indonesia as Waktu Indonesia Bagian Tengah (WITA) and as you might guess, Tengah means central. Waktu Indonesia Bagian Tengah is UTC/GMT +8 hours.

  3. Waktu Indonesia Bagian Timur (WIT) :
    • East Indonesia Time is officially known as Waktu Indonesia Bagian Timur (WIT) and in this situation, Timur means east. Waktu Indnosia Bagian Timur is UTC/GMT +9 hours.


So timezone Samosir Island same as Waktu Indonesia Barat (WIB).