public static String getRFC2616Date(Date date) {SimpleDateFormat df = new SimpleDateFormat(FORMAT_RFC2616, Locale.ENGLISH);df.setTimeZone(new SimpleTimeZone(0, TIME_ZONE));return df.format(date);}

public static string GetRFC2616Date(DateTime datetime){if (null == datetime){datetime = DateTime.UtcNow;}return datetime.ToUniversalTime().GetDateTimeFormats('r') [0];}
