Again, normally you don’t.
Each client has its one loosely syncd simuation.
This can be pretty spot on if you only have the clients respect the server given game time (or any authoritative client in case of P2P), so you rarely get artifacts unless the commections drop for a client.
You need to look into what time that returns.
My guess is that its completely client dependent.
Each client has its own non-replicated instance of game… and not every game necessarily starts at the same time.
Again, this topic / considerations were all specifically for multiplayer server to client setups.
If you have a single player game you can use the local time without any issue.