c# DateTime returns default value when set up with reflection

I have a static method inside a class that sets up an object at runtime like described here: http://ift.tt/1AMjsW4

To that newly created object I add properties combined from different objects that are being sent to my method and I set the values in reflection and return the newly created object. All values appear to have values (so far I tested string and int) - but the values are there.

The problem is when I set a DateTime value to a DateTime property - the returned value is 01/01/0001 and not the date I have set.

Here is the code that sets the values in reflection:

foreach (string key in values.Keys)
{
    if (sqlParams == null || sqlParams.Contains(key))
    {
        PropertyValue propertyValue = values[key];
        object val = propertyValue.Value;
        if (val == null)
            val = getDefaultValue(propertyValue.PropertyType);
         else if (propertyValue.PropertyType == typeof(DateTime) && (DateTime)propertyValue.Value == DateTime.MinValue)
            val = new DateTime(1982, 5, 6);// (DateTime)System.Data.SqlTypes.SqlDateTime.MinValue;
         myType.GetProperty(key).SetValue(obj, val);
    }
}

Why aren't DateTime values being returned correctly?