the command for it is skiptime amount
Skiptime 1 would skip one hour in game.
With a loop script you can have the time running as fast as you want.
#loop
skiptime 0.5
~30
goto "loop"
The above would skip 30 minutes every 30 seconds. Be careful with lag though, a short 0.001 delay and skiptime 0.0001 will make the time acceleration more fluid and smooth, but will also create severe lag.
Also note that skiptime is local for each player.