Happy Rosh Hashanah

Lili: So, why is the jewish holiday on a thursday? Sometimes it is on different day?
Me: It's based on a different calendar, like chinese new year.
Lili: Oh! that is right. so it could be on saturday or sunday?
Me: Sure.
Lili: And today is the first day?
Me: I don't know. It's 5768 or something.
Lili: Wow! That is as long as chinese history!
Me: Right, the jews didn't reset the calendar to 0 for Jesus.
Lili: That is interesting.