code: public Chronology withZone(DateTimeZone zone) {
          if (zone == null) {
              zone = DateTimeZone.getDefault();
          }
          if (zone == getZone()) {
              return this;
          }
          return getInstance(zone, iCutoverInstant, getMinimumDaysInFirstWeek());
      }
docs: Gets the Chronology in a specific time zone.
  
  @param zone  the zone to get the chronology in, null is default
  @return the chronology