Simple timer?

Questions
1

Does anyone know how to make a simple timer that shows up on the screen? This is a noobie question but I’m just getting into programming.

2 
function setup()
time = 0
end

function draw()
time = time + 1 -- If you change this to subtracting, then it will count down by one 
text(time, WIDTH/2, HEIGHT/2)
end
3

tween.delay() works well.

function setup()
    counter = 1
    timer(1,function() counter = counter+1  end)
end

function draw()
    background(0, 0, 0, 255)
    text("Count is: "..counter,WIDTH/2,HEIGHT/2)
end

function timer(t,callback)
    tween.delay(t,function() callback() timer(t,callback) end)
end