Public Class Form1
    Private WithEvents t As New Timer
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles MyBase.Load
        t.Interval = 1000  ' 1 Sekunde
        t.Start()
    End Sub
 
    Private Sub t_Tick(ByVal sender As Object, ByVal e As System.EventArgs) _
      Handles t.Tick
        TextBox1.Text = Now.ToString("HH:mm:ss")
    End Sub
End Class