anchor.diff:    /**
      * Constructs a [DateTime] instance specified in the UTC time zone.
      *
  -   *     DateTime dDay = new DateTime.utc(1944, DateTime.JUNE, 6);
  +   * ```
  +   * var moonLanding = new DateTime.utc(1969, 7, 20, 20, 18, 04);
  +   * ```
  +   *
  +   * When dealing with dates or historic events prefer to use UTC DateTimes,
  +   * since they are unaffected by daylight-saving changes and are unaffected
  +   * by the local timezone.
      */
     DateTime.utc(int year,
         [int month = 1,
  
positive.code:  * A DateTime object is in the local time zone
   * unless explicitly created in the UTC time zone.
   *
   *     DateTime dDay = new DateTime.utc(1944, 6, 6);
   *
   * Use [isUtc] to determine whether a DateTime object is based in UTC.
   * Use the methods [toLocal] and [toUtc]
  
negative.code:  * as in a 24-hour clock.
   * For example:
   *
   * ```
   * var now = new DateTime.now();
   * var berlinWallFell = new DateTime.utc(1989, 11, 9);
   * var moonLanding = DateTime.parse("1969-07-20 20:18:04Z");  // 8:18pm
   * ```
   *
   * A DateTime object is anchored either in the UTC time zone
   * or in the local time zone of the current computer
  