/**
* @param null $startDate
*
* calculate the next date create order of recurring profile
* Timezone of startDate is store's timezone
* Timezone of startDatetime load into recurring profile is store's timezone
*/
public function nextDate($startDate = null)
{
// when recurring profile loaded, startDate updated by currentDate
// timezone used as store's timezone
if ($startDate == null) {
$startDate = $this->_recurringProfile->getStartDatetime();
$date = new DateTime($startDate, new DateTimeZone(Mage_Core_Model_Locale::DEFAULT_TIMEZONE));
$timezone = Mage::app()->getStore()->getConfig(Mage_Core_Model_Locale::XML_PATH_DEFAULT_TIMEZONE);
$date->setTimezone(new DateTimeZone($timezone));
$startDate = $date->format('Y-m-d');
}
$frequency = (int) $this->_recurringProfile->getPeriodFrequency();
$unit = $this->_recurringProfile->getPeriodUnit();
if ($unit === 'week') {
$unit = 'day';
$frequency = $frequency * 7;
}
if ($unit === 'two weeks') {
$unit = 'day';
$frequency = $frequency * 14;
}
$newDate = date('Y-m-d', strtotime('+' . $frequency . $unit, strtotime($startDate)));
if (!$this->_checkDate($unit, $frequency, $startDate, $newDate)) {
$newDate = date('Y-m-d', strtotime('-1day', strtotime(date('Y-m-1', strtotime('+1month', strtotime($newDate))))));
}
$additionalInfo = $this->_recurringProfile->getAdditionalInfo();
$additionalInfo['nextDate'] = $newDate;
$this->_recurringProfile->setAdditionalInfo($additionalInfo);
$this->_recurringProfile->save();
}