When you say "set the control value to 10:00", how exactly are you setting it? E.g. in code with control.Value = new DateTime( 1, 1, 1, 10, 00, 00 )? That would leave the Kind as Unspecified, and the control would have to guess at the appropriate interpretation, which could cause mismatches. Using SpecifyKind may work, if that is the problem.
For the converter approach, here is an example value converter to display time as UTC:
public class DisplayUtcTimeConverter : IValueConverter {
public object Convert( object value, Type targetType, object parameter, CultureInfo culture ) {
string format = parameter.ToString( );
var time = (DateTime)value;
string formattedValue = time.ToUniversalTime( ).ToString( format, culture );
return formattedValue;
}
public object ConvertBack( object value, Type targetType, object parameter, CultureInfo culture ) {
string formattedValue = value.ToString( );
var parsedTime = DateTime.Parse( formattedValue, culture );
var time = DateTime.SpecifyKind( parsedTime, DateTimeKind.Utc );
return time;
}
}
And how you would add it to the control template:
...
<Grid.Resources>
<local:DisplayUtcTimeConverter x:Key="DisplayTimeConverter" />
</Grid.Resources>
...
<TextBox x:Name="PART_DateTimeTextBox"
Grid.Column="1"
Margin="3,0"
Padding="1,0"
Text="{Binding CurrentDateTime, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay, Converter={StaticResource DisplayTimeConverter}, ConverterParameter='h:mm:ss.FFF tt
MM/dd/yyyy'}"
TextAlignment="Right"
TextWrapping="Wrap" />
...
~ Paul H
