/**
* Returns DatePeriod starting from $Date splitted by $interval
*
* @param DateTime $Date Start date
* @param string $interval Interval, for ex. "1 hour"
* @return DatePeriod
*/
protected function _getPeriodByDate(DateTime $Date, $interval = null)
{
$Range = new DateRange(clone $Date);
return $Range->period($this->_getInterval($interval));
}
