docs: public static Duration getDaylightSavingsOffset(Date self) {
          TimeZone timeZone = getTimeZone(self);
          int millis = (timeZone.useDaylightTime() && timeZone.inDaylightTime(self))
                  ? timeZone.getDSTSavings() : 0;
          return new TimeDuration(0, 0, 0, millis);
      }