Change style of clock in status bar.

    <style name="TextAppearance.StatusBar.Clock" parent="@*android:style/TextAppearance.StatusBar.Icon">

        <!-- Note: must be dp to fit in status bar -->

        <item name="android:textSize">16dp</item>

        <item name="android:textStyle">normal</item>

        <item name="android:fontFamily">sans-serif-medium</item>

        <item name="android:textColor">@color/status_bar_clock_color</item>

    </style>