Infinity-Server-Time names a function, with lambda list (D U R):
Accept the client's notification of a server-time adjustment.
Lisp SERVER-TIME = JSON serverTime
This is used to compute the client's round-trip lag time.
{ serverTime: LONG milliseconds since Unix epoch }
{ serverTime: 1589850683000 }
Defined in file src/infinity/legacy-commands.lisp.