I am trying to use the XamDateTimeInput control for new data entry and for editing existing data. In the first scenario the user enters a new date/time value and in the second scenario existing saved date/time data is displayed to the user so they can modify it if necessary.

I have the following XAML.

<ig:XamDateTimeInput Mask={}yyyy/mm/dd hh:mm:ss” Value=”{Binding DateTimeValue}” … />

I have declared a public notifiable property of type DateTime? called DateTimeValue in my ViewModel. If I set the date part of the XamDateTimeInput, using the dropdown and calendar control, it displays something like 2015/01/21 00:00:00 which should be a valid DateTime object, but the binding to my DateTimeValue property is still set to null. When I check DateTimeValue.HasValue its always FALSE until I have set the hour, minute, AND seconds to something other than 00. If I change the value, using the XamDataTimeInput to something like 2015/01/21 01:02:03 then DateTimeValue.HasValue is true. If the value in the XamDateTimeInput is 2015/01/21 01:00:00 or 2015/01/21 01:02:00 than DateTimeValue.HasValue is false.

I would expect all these values to be valid dates and thus the control should update the DateTimeValue property via the Binding. Am I wrong?

My alternative approach was to not bind to the Value but to the Text property. Now any text that has been entered does successfully get updated in the property, which I called DateTimeText. The problem is setting the value of DateTimeText to a valid string representation of Date is not displayed in the XamDateTimeInput.

If someone could give me some advice as to how to setup a binding so that I can get the DateTime value a user and entered in the XamDateTimeInput control and to be able to perform the opposite which is setting a value in my ViewModel that will be displayed in the control. As it stands now I have to use a combination of the Value and Text properties to accomplish this.

I'm using .NET 4.0 and Infragistics v13.1.