How do I create an analog clock using winforms in F#?

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F#

I have to create an analog clock using winforms in f#. The clock also needs to have a label showing date and time in digital form. I have figures out the label time/date, but I'm having problems configurering the graphical representation of the clock and implement the timer function. Is there anyone who can help me on my way?

What I have tried:

open System.Windows.Forms
open System.Drawing
open System

let win = new Form () 
win.ClientSize <- Size (500, 500)

let label = new Label ()
win.Controls.Add label
label.Width <- 200 
label.Text <- string System.DateTime.Now

let timer = new Timer()
timer.Interval <- 1000
timer.Enabled <- true
timer.Tick.Add (fun e -> label.Text <- string System.DateTime.Now)

Application.run win