Horde_Date::weekOfYear PHP Method

    public function weekOfYear()
    {
        return $this->format('W');
    }

 public function __construct(Horde_Date $date)
 {
     $week = $date->weekOfYear();
     $year = $date->year;
     if (!$GLOBALS['prefs']->getValue('week_start_monday') && $date->dayOfWeek() == Horde_Date::DATE_SUNDAY) {
         ++$week;
     }
     if ($week > 51 && $date->month == 1) {
         --$year;
     } elseif ($week == 1 && $date->month == 12) {
         ++$year;
     }
     $this->year = $year;
     $this->week = $week;
     $day = Horde_Date_Utils::firstDayOfWeek($week, $year);
     if (!isset($this->startDay)) {
         if ($GLOBALS['prefs']->getValue('week_start_monday')) {
             $this->startDay = Horde_Date::DATE_MONDAY;
             $this->endDay = Horde_Date::DATE_SUNDAY + 7;
         } else {
             $day->mday--;
             $this->startDay = Horde_Date::DATE_SUNDAY;
             $this->endDay = Horde_Date::DATE_SATURDAY;
         }
     }
     $this->startDate = new Horde_Date($day);
     for ($i = $this->startDay; $i <= $this->endDay; ++$i) {
         $this->days[$i] = new Kronolith_View_Day($day, array());
         $day->mday++;
     }
     $endDate = new Horde_Date($day);
     try {
         $allevents = Kronolith::listEvents($this->startDate, $endDate);
     } catch (Exception $e) {
         $GLOBALS['notification']->push($e, 'horde.error');
         $allevents = array();
     }
     for ($i = $this->startDay; $i <= $this->endDay; ++$i) {
         $date_stamp = $this->days[$i]->dateString();
         $this->days[$i]->events = isset($allevents[$date_stamp]) ? $allevents[$date_stamp] : array();
     }
     $this->sidebyside = $this->days[$this->startDay]->sidebyside;
     $this->_currentCalendars = $this->days[$this->startDay]->currentCalendars;
     $this->slotsPerHour = $this->days[$this->startDay]->slotsPerHour;
     $this->slotsPerDay = $this->days[$this->startDay]->slotsPerDay;
     $this->slotLength = $this->days[$this->startDay]->slotLength;
 }