Issue #3187004 by recrit, a.dmitriiev, mohit_aghera, ranjith_kumar_k_u,...

Issue #3187004 by recrit, a.dmitriiev, mohit_aghera, ranjith_kumar_k_u, larowlan, Matroskeen, smustgrave, Kristen Pol, neclimdul: DrupalDateTime serialization issue

(cherry picked from commit 6db12006)

core/lib/Drupal/Core/Datetime/DrupalDateTime.php

@@ -3,6 +3,7 @@
 namespace Drupal\Core\Datetime;
 
 use Drupal\Component\Datetime\DateTimePlus;
+use Drupal\Core\DependencyInjection\DependencySerializationTrait;
 use Drupal\Core\StringTranslation\StringTranslationTrait;
 
 /**
@@ -21,6 +22,9 @@
 class DrupalDateTime extends DateTimePlus {
 
   use StringTranslationTrait;
+  use DependencySerializationTrait {
+    __sleep as defaultSleep;
+  }
 
   /**
    * Formatted strings translation cache.
@@ -52,7 +56,7 @@ class DrupalDateTime extends DateTimePlus {
    *
    * @var array
    */
-  protected $formatTranslationCache;
+  protected $formatTranslationCache = [];
 
   /**
    * Constructs a date object.
@@ -166,4 +170,11 @@ public function format($format, $settings = []) {
     return $value;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function __sleep(): array {
+    return array_diff($this->defaultSleep(), ['formatTranslationCache']);
+  }
+
 }

core/tests/Drupal/Tests/Core/Datetime/DrupalDateTimeTest.php

@@ -271,4 +271,23 @@ public function testRfc2822DateFormat() {
     }
   }
 
+  /**
+   * Test to avoid serialization of formatTranslationCache.
+   */
+  public function testSleep(): void {
+    $tz = new \DateTimeZone(date_default_timezone_get());
+    $date = new DrupalDateTime('now', $tz, ['langcode' => 'en']);
+
+    // Override timestamp before serialize.
+    $date->setTimestamp(12345678);
+
+    $vars = $date->__sleep();
+    $this->assertContains('langcode', $vars);
+    $this->assertContains('dateTimeObject', $vars);
+    $this->assertNotContains('formatTranslationCache', $vars);
+
+    $unserialized_date = unserialize(serialize($date));
+    $this->assertSame(12345678, $unserialized_date->getTimestamp());
+  }
+
 }