Horde_Mapi_Timezone::_checkTimezone PHP Method

    protected function _checkTimezone(DateTimeZone $timezone, array $offsets)
    {
        list($std, $dst) = $this->_getTransitions($timezone, $this->_startDate);
        if ($this->_checkTransition($std, $dst, $offsets)) {
            return $std;
        }
        return false;
    }