controlpin = 6 ' choose a suitable IO pin
setpin controlpin, dout

settick 1000, checktime ' check the time every second


do
' do other things
loop
end

sub checktime
now$ = time$
print now$
hour$=mid$(now$,1,2)
if hour$ >="18" or hour$ <"08" then ' time is after 6pm or before 8am
fancontrol = 0
else
fancontrol = 1
end if
pin(controlpin) = fancontrol
print fancontrol
end sub