Extract a Date class for event dates

modules/opd_presentations/src/Date.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\opd_presentations;
+
+readonly final class Date {
+
+  public function toTimestamp(): int {
+    return $this->date->getTimestamp();
+  }
+
+  public static function fromString(string $date): self {
+    return new self(new \DateTimeImmutable($date));
+  }
+
+  private function __construct(private \DateTimeImmutable $date) {
+  }
+
+}