code: protected CronScheduleBuilder createCronScheduleBuilder(String cronExpr) {
          int i = cronExpr.indexOf("[");
          int j = cronExpr.indexOf("]");
          TimeZone timezone = defaultTimezone;
          if (i > -1 && j > -1) {
              timezone = TimeZone.getTimeZone(cronExpr.substring(i+1, j));
              cronExpr = cronExpr.substring(0, i).trim();
          }
          return CronScheduleBuilder.cronSchedule(cronExpr).inTimeZone(timezone);
      }
docs: Allow timezone to be configured on a per-cron basis with [timezoneName] appended to the cron format
  @param cronExpr  the modified cron format
  @return  the cron schedule with the timezone applied to it if needed