Shaker/Avalonia/ShakerApp/Views/TimeControl.axaml

<UserControl
    x:Class="ShakerApp.Views.TimeControl"
    xmlns="https://github.com/avaloniaui"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    d:DesignHeight="450"
    d:DesignWidth="800"
    mc:Ignorable="d">
    <UniformGrid Rows="1">
        <StackPanel Orientation="Horizontal">
            <NumericUpDown
                Width="80"
                Increment="1"
                Minimum="0"
                Value="{Binding $parent[UserControl].Hour}" />
            <TextBlock VerticalAlignment="Center" Text=":" />
        </StackPanel>
        <StackPanel Orientation="Horizontal">
            <NumericUpDown
                Width="80"
                Increment="1"
                Maximum="59"
                Minimum="0"
                Value="{Binding $parent[UserControl].Minute}" />
            <TextBlock VerticalAlignment="Center" Text=":" />
        </StackPanel>
        <NumericUpDown
            Width="100"
            Increment="{Binding $parent[UserControl].Increment}"
            Maximum="59"
            Minimum="0"
            Value="{Binding $parent[UserControl].Second}" />
    </UniformGrid>
</UserControl>