code: @Expose
      public static String naturalDay(Date then, Locale locale)
      {
          return naturalDay(DateFormat.SHORT, then, locale);
      }
docs: Same as {@link #naturalDay(Date)} with the given locale.
  
  @param then
  The date
  @param locale
  Target locale
  @return String with 'today', 'tomorrow' or 'yesterday' compared to
  current day. Otherwise, returns a string formatted according to a
  locale sensitive DateFormat.