Whilst an official announcement from Government will not be made until closer to the date, it is expected the Muslim fasting month of Ramadhan will start on/around 19th July, with Idul Fitri Holidays from 18/21 August.
Many offices will be closing earlier than usual during this month, and factories will generally slow / stop production.
17th August is also a national holiday for Independence Day.
Please see the below circular issued from the Ministry of Transportation:
Click here for original version.
Click here for English version.
For further information, please contact firstname.lastname@example.org