As it is the first day only, I haven't experienced a lot but only a few things I have noticed. Around 3:00 AM the minarets started with announcements. And as both my arabic and bahasa are poor....I can't tell you what they are. In front of my appartment there are normally some small stalls......not today though. Lots of dates etc available in supermarkets (used to break the fast).
This coming week will be able to share more on the impact, as I have a run a few workshops with mixed audience. As the workshops will be followed by dinners, we have arranged some "fast breaking kits" for the people that might want to use it. Just so they don't go for dinner on a completely empty stomach.
And here for your reading: