Learn Hardcore Indonesian: Kelas daring kami dimulai setengah delapan. - Our online class starts at half past seven.

Daring is the Indonesian equivalent of “online,” formed from dalam jaringan (“in-network”). It’s widely used in education and official contexts. You’ll also hear online used informally, and both are acceptable: kelas daring and kelas online both mean “online class.”

Why is kami used instead of kita? What would change if I say kita?

Kami = “we/our” excluding the listener. Kita = “we/our” including the listener.

If you’re speaking to someone who is not in the class, kelas daring kami is right.
If you’re speaking to classmates (including them), use kelas daring kita: “our (you and I) online class.”

Does setengah delapan mean 7:30 or 8:30?

It means 7:30. Literally “half (to) eight,” i.e., halfway from seven to eight.

setengah tujuh = 6:30
setengah delapan = 7:30
setengah sembilan = 8:30
This is a very common source of confusion for English speakers.

Do I need to say jam or pukul before the time?

You can say the time with or without jam/: