MonthDate.php

<?php

namespace Drupal\views\Plugin\views\argument;

use Drupal\views\Attribute\ViewsArgument;

/**
 * Argument handler for a month (MM)
 */
class MonthDate extends Date {
    
    /**
     * {@inheritdoc}
     */
    protected $format = 'F';
    
    /**
     * {@inheritdoc}
     */
    protected $argFormat = 'm';
    
    /**
     * {@inheritdoc}
     */
    public function summaryName($data) {
        $month = str_pad($data->{$this->name_alias}, 2, '0', STR_PAD_LEFT);
        try {
            return $this->dateFormatter
                ->format(strtotime("2005" . $month . "15" . " 00:00:00 UTC"), 'custom', $this->format, 'UTC');
        } catch (\InvalidArgumentException $e) {
            return parent::summaryName($data);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function title() {
        $month = str_pad($this->argument, 2, '0', STR_PAD_LEFT);
        try {
            return $this->dateFormatter
                ->format(strtotime("2005" . $month . "15" . " 00:00:00 UTC"), 'custom', $this->format, 'UTC');
        } catch (\InvalidArgumentException $e) {
            return parent::title();
        }
    }
    public function summaryArgument($data) {
        // Make sure the argument contains leading zeroes.
        return str_pad($data->{$this->base_alias}, 2, '0', STR_PAD_LEFT);
    }

}