Just want to make sure this is right. I am planning to arrive CGK at 11:35 pm on 28 Aug. Assuming I get to immigration on 28 Aug then that is day 1 for the visa, right? Then 26 Sept would be day 30 so I would need to leave on that date or before? Right now, I'm planning to leave Manado on 23 Sept, but I would like to leave on 25 Sept. I'm just a bit concerned about what happens if the flight is delayed or cancelled. I'm planning to fly SilkAir if that makes any difference.