title: Why does System.Convert has ToDateTime that accepts DateTime?
body: <pre><code>//
  // Summary:
  //     Returns the specified System.DateTime object; no actual conversion is performed.
  //
  // Parameters:
  //   value:
  //     A date and time value.
  //
  // Returns:
  //     value is returned unchanged.
  public static DateTime ToDateTime(DateTime value);
  </code></pre>
  
  <p>Why does <code>System.Convert</code> has <code>ToDateTime</code> that accepts DateTime ?</p>
  
  <p>The method documentation states the value remain unchanged.</p>