On a Terraria dedicated server, does time pass if no one is playing?
I ask because I've started farming, and it would mean I can simply leave a dedicated server running without being connected, and still have grass spread.
No, time does not pass and world updates do not occur when no players are connected. You can easily verify that by issuing the time
command a couple times with no players present — you'll see that the in-game time doesn't change.
You used to be able to keep a world going by just loading it with the server software, but this was changed in patch 1.0.5:
Server
- Servers now hibernate when no players are connected.