code: public static GJChronology getInstance(
              DateTimeZone zone,
              long gregorianCutover,
              int minDaysInFirstWeek) {
          
          Instant cutoverInstant;
          if (gregorianCutover == DEFAULT_CUTOVER.getMillis()) {
              cutoverInstant = null;
          } else {
              cutoverInstant = new Instant(gregorianCutover);
          }
          return getInstance(zone, cutoverInstant, minDaysInFirstWeek);
      }
docs: Factory method returns instances of the GJ cutover chronology. Any
  cutover date may be specified.
  
  @param zone  the time zone to use, null is default
  @param gregorianCutover  the cutover to use
  @param minDaysInFirstWeek  minimum number of days in first week of the year; default is 4