/**
* Returns the calculated date
*
* @param string $calc Calculation to make
* @param string|integer|Zend_Date $date Date to calculate with, if null the actual date is taken
* @param string $format Dateformat for parsing
* @param string|Zend_Locale $locale Locale for parsing input
* @return integer|Zend_Date new date
* @throws Zend_Date_Exception
*/
private function _date($calc, $date, $format, $locale)
{
if (is_null($date)) {
throw new Zend_Date_Exception('parameter $date must be set, null is not allowed');
}
if ($locale === null) {
$locale = $this->getLocale();
}
if ($calc == 'set' or $calc == 'cmp') {
$gmt = $this->setGmt(false);
} else {
$gmt = $this->setGmt(true);
}
if ($date instanceof Zend_Date) {
// extract date from object
$date = $date->get(Zend_Date::DATE_MEDIUM, $locale);
} else {
$parsed = Zend_Locale_Format::getDate($date, $format, $locale);
$date = new Zend_Date(0, Zend_Date::TIMESTAMP, $locale);
$date->setGmt(true);
$date->set($parsed['year'], Zend_Date::YEAR);
$date->set($parsed['month'], Zend_Date::MONTH_SHORT);
$date->set($parsed['day'], Zend_Date::DAY);
$date = $date->get(Zend_Date::DATE_MEDIUM, $locale);
}
$return = $this->_calcdetail($calc, $date, Zend_Date::DATE_MEDIUM, $locale);
$this->setGmt($gmt);
if ($calc != 'cmp') {
return $this;
}
return $return;
}
