code: public static String naturalTime(final Date reference, final Date duration, final TimeMillis precision,
              final Locale locale)
      {
          return naturalTime(reference, duration, precision.millis(), locale);
      }
docs: Same as {@link #naturalTime(Date, Date, long, Locale)}.
  
  @param reference
  The reference
  @param duration
  The duration
  @param precision
  The precesion to retain in milliseconds
  @param locale
  The locale
  @return String representing the relative date