docs: public static DateFormat getDateFormatter() {
          SoftReference<DateFormat> ref = dateFormatter.get();
          DateFormat formatter = ref != null ? ref.get() : null;
          if (formatter == null) {
              formatter = new SimpleDateFormat(DATE_FORMAT);
              formatter.setCalendar(new GregorianCalendar(new SimpleTimeZone(0, "GMT")));
              dateFormatter.set(new SoftReference<DateFormat>(formatter));
          }
          return formatter;
      }