/**
  * Get step to recurring day from current day of week in date.
  * @param $dateStamp
  * @param $recurringWeekDay
  * @return int
  */
 private function _getRecurringDayStep($dateStamp, $recurringWeekDay)
 {
     $weekDay = SchedulerHelperDate::getDayOfWeek($dateStamp);
     $dayStep = $recurringWeekDay - $weekDay;
     $dayStep = $dayStep < 0 ? SchedulerHelperDate::DAYS_IN_WEEK - -$dayStep : $dayStep;
     return $dayStep;
 }