There is an article Creating a Clock with Silverlight which describes how to create Silverlight clock. Following those steps and with a few changes, clock can be made to work with timer instead of Storyboard Animation.
Demo

Create clock hands and their shadow in Page.xaml
<Canvas Width="126.667" Height="126.667" x:Name="Time">

<Canvas Width="126.667" Height="126.667" x:Name="Hour" RenderTransformOrigin="0.5,0.5">

<Canvas.RenderTransform>

<RotateTransform Angle="0" x:Name="HourAngle" />

</Canvas.RenderTransform>

<Rectangle Width="1.833" Height="40" RadiusX="1" RadiusY="1" Canvas.Top="30.001" Canvas.Left="62.413" RenderTransformOrigin="0.5,0.5" Stroke="#7F434343" StrokeThickness="0.2">

<Rectangle.Fill>

<RadialGradientBrush>

<GradientStop Color="#FF4F4F4F" Offset="1"/>

<GradientStop Color="#FF120F0F" Offset="0"/>

</RadialGradientBrush>

</Rectangle.Fill>

</Rectangle>

</Canvas>

<Canvas Width="126.667" Height="126.667" RenderTransformOrigin="0.508,0.508" x:Name="HourShadow">

<Canvas.RenderTransform>

<RotateTransform Angle="0" x:Name="HourShadowAngle" />

</Canvas.RenderTransform>

<Rectangle Width="2.25" Height="40" RadiusX="1" RadiusY="1" Canvas.Top="31" Canvas.Left="63.205" StrokeThickness="0.2">

<Rectangle.OpacityMask>

<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

<GradientStop Color="#004F4F4F" Offset="1"/>

<GradientStop Color="#88120F0F" Offset="0.02"/>

<GradientStop Color="#88120F0F" Offset="0.98"/>

<GradientStop Color="#004F4F4F" Offset="0"/>

</LinearGradientBrush>

</Rectangle.OpacityMask>

<Rectangle.Fill>

<LinearGradientBrush EndPoint="1,0" StartPoint="0,0">

<GradientStop Color="#004F4F4F" Offset="1"/>

<GradientStop Color="#99120F0F" Offset="0.4"/>

<GradientStop Color="#99120F0F" Offset="0.6"/>

<GradientStop Color="#004F4F4F" Offset="0"/>

</LinearGradientBrush>

</Rectangle.Fill>

</Rectangle>

</Canvas>

<Canvas Width="126.667" Height="126.667" x:Name="Minute" RenderTransformOrigin="0.5,0.5">

<Canvas.RenderTransform>

<RotateTransform Angle="0" x:Name="MinuteAngle" />

</Canvas.RenderTransform>

<Rectangle Width="1.083" Height="60.666" RadiusX="1" RadiusY="1" Canvas.Top="14.095" Canvas.Left="62.788" RenderTransformOrigin="0.5,0.5" Stroke="#7F434343" StrokeThickness="0.2">

<Rectangle.Fill>

<RadialGradientBrush>

<GradientStop Color="#FF4F4F4F" Offset="1"/>

<GradientStop Color="#FF120F0F" Offset="0"/>

</RadialGradientBrush>

</Rectangle.Fill>

</Rectangle>

</Canvas>

<Canvas Width="126.667" Height="126.667" RenderTransformOrigin="0.508,0.508" x:Name="MinuteShadow">

<Canvas.RenderTransform>

<RotateTransform Angle="0" x:Name="MinuteShadowAngle" />

</Canvas.RenderTransform>

<Rectangle Width="1.75" Height="60.666" RadiusX="1" RadiusY="1" Canvas.Top="15.345" Canvas.Left="64.038" StrokeThickness="0.2">

<Rectangle.OpacityMask>

<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

<GradientStop Color="#004F4F4F" Offset="1"/>

<GradientStop Color="#88120F0F" Offset="0.02"/>

<GradientStop Color="#88120F0F" Offset="0.98"/>

<GradientStop Color="#004F4F4F" Offset="0"/>

</LinearGradientBrush>

</Rectangle.OpacityMask>

<Rectangle.Fill>

<LinearGradientBrush EndPoint="1,0" StartPoint="0,0">

<GradientStop Color="#004F4F4F" Offset="1"/>

<GradientStop Color="#99120F0F" Offset="0.4"/>

<GradientStop Color="#99120F0F" Offset="0.6"/>

<GradientStop Color="#004F4F4F" Offset="0"/>

</LinearGradientBrush>

</Rectangle.Fill>

</Rectangle>

</Canvas>

<Canvas Width="126.667" Height="126.667" x:Name="Second" RenderTransformOrigin="0.5,0.5">

<Canvas.RenderTransform>

<RotateTransform Angle="0" x:Name="SecondAngle" />

</Canvas.RenderTransform>

<Rectangle Width="0.802" Height="65" RadiusX="1" RadiusY="1" Canvas.Top="10" Canvas.Left="62.927" RenderTransformOrigin="0.5,0.5" Stroke="#339F0000" StrokeThickness="0.2">

<Rectangle.Fill>

<RadialGradientBrush>

<GradientStop Color="#BDC70A0A" Offset="1"/>

<GradientStop Color="#FF7C0C0C" Offset="0.357"/>

</RadialGradientBrush>

</Rectangle.Fill>

</Rectangle>

</Canvas>

<Canvas Width="126.667" Height="126.667" RenderTransformOrigin="0.508,0.508" x:Name="SecondShadow">

<Canvas.RenderTransform>

<RotateTransform Angle="0" x:Name="SecondShadowAngle" />

</Canvas.RenderTransform>

<Rectangle Width="0.75" Height="65" RadiusX="1" RadiusY="1" Canvas.Top="11.5" Canvas.Left="64.538" StrokeThickness="0.2">

<Rectangle.OpacityMask>

<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

<GradientStop Color="#004F4F4F" Offset="1"/>

<GradientStop Color="#88120F0F" Offset="0.02"/>

<GradientStop Color="#88120F0F" Offset="0.98"/>

<GradientStop Color="#004F4F4F" Offset="0"/>

</LinearGradientBrush>

</Rectangle.OpacityMask>

<Rectangle.Fill>

<LinearGradientBrush EndPoint="1,0" StartPoint="0,0">

<GradientStop Color="#004F4F4F" Offset="1"/>

<GradientStop Color="#99120F0F" Offset="0.4"/>

<GradientStop Color="#99120F0F" Offset="0.6"/>

<GradientStop Color="#004F4F4F" Offset="0"/>

</LinearGradientBrush>

</Rectangle.Fill>

</Rectangle>

</Canvas>

<Ellipse Width="3" Height="3" StrokeThickness="0.1" Canvas.Left="61.83" Canvas.Top="61.83">

<Ellipse.Fill>

<RadialGradientBrush>

<GradientStop Color="#FF3F3F3F" Offset="0.969"/>

<GradientStop Color="#00353535" Offset="1"/>

<GradientStop Color="#FF1E1E1E" Offset="0.478"/>

<GradientStop Color="#FF000000" Offset="0"/>

</RadialGradientBrush>

</Ellipse.Fill>

</Ellipse>

</Canvas>

<Canvas Width="126.667" Height="126.667" x:Name="Reflection">

<Ellipse Width="116.5" Height="116.5" Canvas.Left="5.083" Canvas.Top="5.083">

<Ellipse.Fill>

<RadialGradientBrush GradientOrigin="0.512,0.553">

<RadialGradientBrush.RelativeTransform>

<TransformGroup>

<ScaleTransform CenterX="0.5" CenterY="0.5" ScaleX="2.238" ScaleY="1.125"/>

<SkewTransform AngleX="0" AngleY="0" CenterX="0.5" CenterY="0.5"/>

<RotateTransform Angle="-34.092" CenterX="0.5" CenterY="0.5"/>

<TranslateTransform X="0.112" Y="-0.022"/>

</TransformGroup>

</RadialGradientBrush.RelativeTransform>

<GradientStop Color="#40FFFFFF" Offset="1"/>

<GradientStop Color="#80FFFFFF" Offset="0.645"/>

<GradientStop Color="#40FFFFFF" Offset="0.64"/>

<GradientStop Color="#00FFFFFF" Offset="0.57"/>

</RadialGradientBrush>

</Ellipse.Fill>

<Ellipse.OpacityMask>

<RadialGradientBrush>

<GradientStop Color="#FF000000" Offset="0.772"/>

<GradientStop Color="#88FFFFFF" Offset="0.96"/>

<GradientStop Color="#66FFFFFF" Offset="0.965"/>

<GradientStop Color="#44FFFFFF" Offset="0.985"/>

<GradientStop Color="#00FFFFFF" Offset="1"/>

</RadialGradientBrush>

</Ellipse.OpacityMask>

</Ellipse>

</Canvas>

</Canvas>

Define DispatcherTimer and Clock tick in Page.xaml.cs
DispatcherTimer dt;

public Page()

{

dt = new DispatcherTimer();

InitializeComponent();

//Define the event that will occur at timer tick

dt.Tick += new EventHandler(Clock);

//Set the timer interval

dt.Interval = TimeSpan.FromSeconds(1);

//strat the timer

dt.Start();

}

void Clock(object sender, EventArgs e)

{

TextBlockDigital.Text = DateTime.Now.ToLongTimeString();

RotateTransform rotateTransform = new RotateTransform();

//Set the angle of Second and SecondShadow

//One tick=6 degrees

rotateTransform.Angle = DateTime.Now.Second * 6;

Second.RenderTransform = rotateTransform;

SecondShadow.RenderTransform = rotateTransform;

//Set the angle of Minute and SecondShadow

rotateTransform = new RotateTransform();

rotateTransform.Angle = DateTime.Now.Minute * 6;

Minute.RenderTransform = rotateTransform;

MinuteShadow.RenderTransform = rotateTransform;

int hr = DateTime.Now.Hour;

if (hr >= 12)

hr = hr - 12;

//Set the angle of Hour and HourShadow

rotateTransform = new RotateTransform();

rotateTransform.Angle = (hr * 30) + DateTime.Now.Minute / 2;

Hour.RenderTransform = rotateTransform;

HourShadow.RenderTransform = rotateTransform;

}