Pubic Holidays

New Year's Day (Jan 1),
Chinese New Year (dependent on the lunar calendar)
Birthday of Prophet Mohammed (dependent on the lunar calendar)
Nyepi (when everything, including the airports shut down, in late March) 
Good Friday (April 2)
Easter Sunday (First Sunday in April)
Ascension of Jesus Christ in Heaven (39 days after Easter Sunday)
Muslim New Year (dependent on the lunar calendar),
Ascension Day of Prophet Mohammed (dependent on the lunar calendar)
Indonesia Independence Day (Aug 17)
Shared Holiday by government decree (Sept 9)
Idul Fitri (dependent on the lunar calendar)
Shared Holiday by government decree (Sept 13)
Id-ul-Adha (2 months and 9 days usually after Idul Fitri)
Shared holiday by government decree (Dec 24)
Christmas (Dec 25).