Thursday 01 Jan New Year's Day
Saturday 03 Jan The Prophet Muhammad’s Birthday
Thursday 19 Feb Chinese Lunar New Year's Day
Saturday 21 Mar Bali's Day of Silence and Hindu New Year
Friday 03 Apr Good Friday
Friday 01 May International Labor Day
Thursday 14 May Ascension Day of Jesus Christ
Saturday 16 May Ascension of the Prophet Muhammad
Tuesday 02 Jun Waisak Day (Buddha's Anniversary)
Thursday 16 Jul Joint Holiday before Idul Fitri
Friday 17 Jul Idul Fitri Day 1
Saturday 18 Jul Idul Fitri Day 2
Monday 20 Jul Joint Holiday After Idul Fitri
Tuesday 21 Jul Second Joint Holiday After Idul Fitri
Monday 17 Aug Indonesian Independence Day
Thursday 24 Sep Muslim Day of Sacrifice (Idul Adha)
Wednesday 14 Oct Muharram/Islamic New Year
Thursday 24 Dec Christmas Eve common leave
Friday 25 Dec Christmas Day
Source: https://www.timeanddate.com/holidays/indonesia/2015#!hol=9