Issue #2851902 by mpdonadio: Replace $date->format('U') with $date->getTimestamp()

core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeDefaultFormatter.php

@@ -100,7 +100,7 @@ public function settingsForm(array $form, FormStateInterface $form_state) {
     $format_types = $this->dateFormatStorage->loadMultiple();
     $options = [];
     foreach ($format_types as $type => $type_info) {
-      $format = $this->dateFormatter->format($time->format('U'), $type);
+      $format = $this->dateFormatter->format($time->getTimestamp(), $type);
       $options[$type] = $type_info->label() . ' (' . $format . ')';
     }
 

core/modules/datetime_range/src/Plugin/Field/FieldFormatter/DateRangeCustomFormatter.php

@@ -48,7 +48,7 @@ public function viewElements(FieldItemListInterface $items, $langcode) {
         /** @var \Drupal\Core\Datetime\DrupalDateTime $end_date */
         $end_date = $item->end_date;
 
-        if ($start_date->format('U') !== $end_date->format('U')) {
+        if ($start_date->getTimestamp() !== $end_date->getTimestamp()) {
           $elements[$delta] = [
             'start_date' => $this->buildDate($start_date),
             'separator' => ['#plain_text' => ' ' . $separator . ' '],

core/modules/datetime_range/src/Plugin/Field/FieldFormatter/DateRangeDefaultFormatter.php

@@ -49,7 +49,7 @@ public function viewElements(FieldItemListInterface $items, $langcode) {
         /** @var \Drupal\Core\Datetime\DrupalDateTime $end_date */
         $end_date = $item->end_date;
 
-        if ($start_date->format('U') !== $end_date->format('U')) {
+        if ($start_date->getTimestamp() !== $end_date->getTimestamp()) {
           $elements[$delta] = [
             'start_date' => $this->buildDateWithIsoAttribute($start_date),
             'separator' => ['#plain_text' => ' ' . $separator . ' '],

core/modules/datetime_range/src/Plugin/Field/FieldFormatter/DateRangePlainFormatter.php

@@ -48,7 +48,7 @@ public function viewElements(FieldItemListInterface $items, $langcode) {
         /** @var \Drupal\Core\Datetime\DrupalDateTime $end_date */
         $end_date = $item->end_date;
 
-        if ($start_date->format('U') !== $end_date->format('U')) {
+        if ($start_date->getTimestamp() !== $end_date->getTimestamp()) {
           $elements[$delta] = [
             'start_date' => $this->buildDate($start_date),
             'separator' => ['#plain_text' => ' ' . $separator . ' '],

core/modules/datetime_range/src/Plugin/Field/FieldWidget/DateRangeWidgetBase.php

@@ -129,7 +129,7 @@ public function validateStartEnd(array &$element, FormStateInterface $form_state
     $end_date = $element['end_value']['#value']['object'];
 
     if ($start_date instanceof DrupalDateTime && $end_date instanceof DrupalDateTime) {
-      if ($start_date->format('U') !== $end_date->format('U')) {
+      if ($start_date->getTimestamp() !== $end_date->getTimestamp()) {
         $interval = $start_date->diff($end_date);
         if ($interval->invert === 1) {
           $form_state->setError($element, $this->t('The @title end date cannot be before the start date', ['@title' => $element['#title']]));

core/modules/search/src/Tests/SearchDateIntervalTest.php

@@ -43,13 +43,13 @@ protected function setUp() {
         'format' => $default_format,
       ],
       'langcode' => 'en',
-      'created' => $created_time_en->format('U'),
+      'created' => $created_time_en->getTimestamp(),
     ]);
 
     // Add Spanish translation to the node.
     $translation = $node->addTranslation('es', ['title' => 'Node ES']);
     $translation->body->value = $this->randomMachineName(32);
-    $translation->created->value = $created_time_es->format('U');
+    $translation->created->value = $created_time_es->getTimestamp();
     $node->save();
 
     // Update the index.