A calendar written with IntlCalendar class

Code
<?php

// Berlin - Germany
$c IntlCalendar::createInstance('Europe/Berlin''de_DE');
$renderer = new CalendarMonthRenderer(new IntlDateFormatter('de_DE'nullnull));
echo 
$renderer->render(new CalendarMonth($c));

// USA - New York
$c IntlCalendar::createInstance('America/New_York''en_US');
$renderer = new CalendarMonthRenderer(new IntlDateFormatter('en_US'nullnull));
echo 
$renderer->render(new CalendarMonth($c));


/**
 * This code snippet is no copy and paste example. It has no error
 * handling and isn't generic or clean written enough to be used in 
 * production.
 */
class CalendarMonth
{
    private 
$calendar;
    private 
$now;
    
    const 
DAY IntlCalendar::FIELD_DATE;
    const 
MONTH IntlCalendar::FIELD_MONTH;
    const 
DOW_LOCAL IntlCalendar::FIELD_DOW_LOCAL;
    
    public function 
__construct(IntlCalendar $calendar)
    {
        
$this->calendar $calendar;
        
$this->now $calendar->getTime();
    }
    
    public function 
getNow()
    {
        return 
$this->now;
    }
    
    public function 
createStructure()
    {
        
$calendar $this->calendar;
        
        
// beginning of the week
        
$calendar->set(self::DAY$calendar->getMinimum(self::DAY));
        
$dayOfWeek $calendar->get(self::DOW_LOCAL);
        
$month $calendar->get(self::MONTH);
        
$calendar->add(self::DAY, -($dayOfWeek 1));

        
$structure = [];
        
$week = [];
        while (
$calendar->get(self::MONTH) <= $month || 
            !
$this->isNewWeek($calendar)
        ) {
            if (
$this->isNewWeek($calendar)) {
                
$week = [];
            }
            
            
$week[] = $calendar->getTime();
            
            if (
$this->isEndOfWeek($calendar)) {
                
$structure[] = $week;
                if (
$calendar->get(self::MONTH) != $month) {
                    break;
                }
            }
            
            
$calendar->add(self::DAY1);
        }
        
        return 
$structure;
    }
    
    private function 
isNewWeek(IntlCalendar $c)
    {
        return 
=== $c->get(self::DOW_LOCAL);
    }
    
    private function 
isEndOfWeek(IntlCalendar $c)
    {
        return 
=== $c->get(self::DOW_LOCAL);
    }
}

class 
CalendarMonthRenderer
{
    private 
$formatter;
    
    public function 
__construct(IntlDateFormatter $formatter)
    {
        
$this->formatter $formatter;
    }
    
    public function 
render(CalendarMonth $calendar)
    {
        
$days $weekdays '';
        foreach (
$calendar->createStructure() as $pos => $week) {
            
$days .= '<tr>';
            foreach(
$week as $day) {
                if (
=== $pos) {
                    
$weekdays .= '<td>' $this->format($day 1000'E') . '</td>';
                }
            
                
$days .= '<td align="right">' $this->format($day 1000'd') . '</td>';
            }
            
$days .= '</tr>';
        }
        
        
$caption '<caption>' $this->format($calendar->getNow() / 1000'LLLL') . '</caption>';
        
        return 
'<table border="1">' $caption '<tr>' $weekdays '</tr>' $days '</table>';
    }
    
    private function 
format($c$format)
    {
        
$this->formatter->setPattern($format);
        return 
$this->formatter->format($c);
    }
}
Result
Juni
Mo.Di.Mi.Do.Fr.Sa.So.
2930311234
567891011
12131415161718
19202122232425
262728293012
June
SunMonTueWedThuFriSat
28293031123
45678910
11121314151617
18192021222324
2526272829301
Used Versions
PHP 7.1, Zend 3.0, Symfony 3.2, Laravel 5.2, PHPUnit 5.6, Doctrine 2.6