code: public static CronSchedule dailyAtHourAndMinute(int hour, int minute) {
          String expression = String.format("0 %d %d ? * *", minute, hour);
          return of(expression);
      }
docs: Creates cron expression which schedule task execution
  every day at the given time
  
  @param hour of schedule
  @param minute of schedule
  @return object
  @throws IllegalArgumentException
  wrapping a ParseException if the expression is invalid