title: Default parameter for value must be a compile time constant?
body: <p>This is my method signature. While trying to pass <code>end</code> as an optional parameter it gives me this error. What should I do to resolve this? Why isn't <code>DateTime.MinValue</code> a constant?</p>
  
  <pre><code>public static void DatesToPeriodConverter(DateTime start, DateTime end = DateTime.MinValue,
                                            out string date, out string time)
  </code></pre>