Question

I am not sure how this became the display value as I have not specified this anywhere in my application.

<DatePicker Grid.Column="1" Grid.Row="3" 
    Height="25" 
    HorizontalAlignment="Left"
    Margin="12,1,0,0" 
    x:Name="datePicker_dob" 
    Validation.Error="Validation_Error" 
    SelectedDate="{Binding UpdateSourceTrigger=PropertyChanged,
                   Path= dob,
                   ValidatesOnDataErrors=True,
                   NotifyOnValidationError=True}" 
    VerticalAlignment="Top" 
    Width="115" 
    SelectedDateFormat="Short" />

Answer 1

The answer is in your question 🙂 As you have not specified the value, its showing the minValue. You just need to set it some value like today’s date