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copied!<p>The only way I could think of to do it is to have a DateTime property where you only allow the setter change the time.</p> <p>XAML:</p> <pre><code><UserControl.Resources> <mine:DateTimeConverter x:Key="MyDateTimeConverter" /> </UserControl.Resources> <Grid x:Name="LayoutRoot"> <TextBox x:Name="myTextBox" Text="{Binding Path=TestDateTime, Converter={StaticResource MyDateTimeConverter}, Mode=TwoWay}" /> </Grid> </code></pre> <p>C# Code behind:</p> <pre><code> public partial class Page : UserControl { private TestClass m_testClass = new TestClass(); public Page() { InitializeComponent(); myTextBox.DataContext = m_testClass; } } </code></pre> <p>C# TestClass where the property setter restriction is used:</p> <pre><code>public class TestClass : INotifyPropertyChanged { private DateTime m_testDateTime = DateTime.Now; public DateTime TestDateTime { get { return m_testDateTime; } set { m_testDateTime = m_testDateTime.Date.Add(value.TimeOfDay); PropertyChanged(this, new PropertyChangedEventArgs("TestDateTime")); } } public event PropertyChangedEventHandler PropertyChanged = (t, e) => {}; } </code></pre> <p>C# IValueConverter:</p> <pre><code>public class DateTimeConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { DateTime date = (DateTime)value; return date.ToString("HH:mm"); } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { string strValue = value.ToString(); DateTime resultDateTime; if (DateTime.TryParse(strValue, out resultDateTime)) { return resultDateTime; } return value; } } </code></pre>

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