Estimated authoritative-server clock, in milliseconds since the epoch, or undefined until the first
ping has been answered. Every client in the room converges on this clock, so it is the one to schedule
shared events against (countdowns, song positions, race starts). The server returns its own clock.
Estimated authoritative-server clock, in milliseconds since the epoch, or undefined until the first ping has been answered. Every client in the room converges on this clock, so it is the one to schedule shared events against (countdowns, song positions, race starts). The server returns its own clock.