Minecraft 'Clock' Program

C = 0
while C == 0 do

if os.time == 12.000 then
print("Midday")
redstone.setOutput( "top", true )

redstone.setOutput( "bottom", false )
redstone.setOutput( "left", false )
redstone.setOutput( "right", false )
end

if os.time == 18.000 then
print("Dusk")
redstone.setOutput( "left", true )

redstone.setOutput( "top", false )
redstone.setOutput( "bottom", false )
redstone.setOutput( "right", false )
end

if os.time == 24.000 or os.time == 0.000 then
print("Midnight")
redstone.setOutput( bottom, true )

redstone.setOutput( top, false )
redstone.setOutput( left, false )
redstone.setOutput( right, false )
end

if os.time == 6.000 then
print("Dawn")
redstone.setOutput( right, true )

redstone.setOutput( top, false )
redstone.setOutput( bottom, false )
redstone.setOutput( left, false )
end

os.sleep(1)
local nTime = os.time()
print( "The time is "..textutils.formatTime( nTime, false ) )
local monitor = peripheral.wrap( "back" )
term.redirect( monitor )

end