/**
* adds diff to date and applies dst fix
*
* @param Tinebase_DateTime $_dateInUTC
* @param DateTimeInterval $_diff
* @param string $_timezoneForDstFix
*/
public static function addUTCDateDstFix($_dateInUTC, $_diff, $_timezoneForDstFix)
{
$_dateInUTC->setTimezone($_timezoneForDstFix);
$_dateInUTC->add($_dateInUTC->get('I') ? 1 : 0, Tinebase_DateTime::MODIFIER_HOUR);
$_dateInUTC->add($_diff);
$_dateInUTC->subHour($_dateInUTC->get('I') ? 1 : 0);
$_dateInUTC->setTimezone('UTC');
}
/**
* get string representation of first and last days of the week defined by date/week number
*
* @param Tinebase_DateTime $_date
* @param integer $_weekNumber optional
* @return array
*/
protected function _getFirstAndLastDayOfWeek(Tinebase_DateTime $_date, $_weekNumber = NULL)
{
$firstDayOfWeek = $this->_getFirstDayOfWeek();
if ($_weekNumber !== NULL) {
$_date->setWeek($_weekNumber);
}
$dayOfWeek = $_date->get('w');
// in some locales sunday is last day of the week -> we need to init dayOfWeek with 7
$dayOfWeek = $firstDayOfWeek == 1 && $dayOfWeek == 0 ? 7 : $dayOfWeek;
$_date->sub($dayOfWeek - $firstDayOfWeek, Tinebase_DateTime::MODIFIER_DAY);
$firstDay = $_date->toString($this->_dateFormat);
$_date->add(6, Tinebase_DateTime::MODIFIER_DAY);
$lastDay = $_date->toString($this->_dateFormat);
$result = array($firstDay, $lastDay);
return $result;
}
