diff --git a/date_content.info.yml b/date_content.info.yml
index a21d512..a33a949 100644
--- a/date_content.info.yml
+++ b/date_content.info.yml
@@ -1,8 +1,7 @@
 name: 'Date Content Augmenter'
 type: module
 description: 'Associate content with any date value'
-core: 8.x
-core_version_requirement: '^8 || ^9'
+core_version_requirement: ^9.3 || ^10
 package: 'Date Augmenter'
 dependencies:
   - 'date_augmenter:date_augmenter'
diff --git a/src/Entity/DateContent.php b/src/Entity/DateContent.php
index 948ecfa..e7873ef 100644
--- a/src/Entity/DateContent.php
+++ b/src/Entity/DateContent.php
@@ -164,7 +164,7 @@ class DateContent extends ContentEntityBase implements DateContentInterface {
       $field_delta = (int) $this->field_delta->get(0)->getString();
       $parent_field_value = $parent->get($field_name)->get($field_delta)->view();
       if (!empty($parent_field_value['start'])) {
-        $start = render($parent_field_value);
+        $start = \Drupal::service('renderer')->render($parent_field_value);
       }
       else {
         // @todo Provide better fallback behaviour.
diff --git a/src/Form/DateContentForm.php b/src/Form/DateContentForm.php
index 9dae817..0bead87 100644
--- a/src/Form/DateContentForm.php
+++ b/src/Form/DateContentForm.php
@@ -51,7 +51,7 @@ class DateContentForm extends ContentEntityForm {
         $field_delta = (int) $entity->field_delta->get(0)->getString();
         $parent_field_value = $parent->get($field_name)->get($field_delta)->view();
         if (!empty($parent_field_value['start'])) {
-          $start = render($parent_field_value);
+          $start = \Drupal::service('renderer')->render($parent_field_value);
         }
         else {
           // @todo Provide better fallback behaviour.
diff --git a/src/Form/DateContentRevisionDeleteForm.php b/src/Form/DateContentRevisionDeleteForm.php
index 0a49b17..3cfdb3f 100644
--- a/src/Form/DateContentRevisionDeleteForm.php
+++ b/src/Form/DateContentRevisionDeleteForm.php
@@ -57,7 +57,7 @@ class DateContentRevisionDeleteForm extends ConfirmFormBase {
    */
   public function getQuestion() {
     return $this->t('Are you sure you want to delete the revision from %revision-date?', [
-      '%revision-date' => format_date($this->revision->getRevisionCreationTime()),
+      '%revision-date' => \Drupal::service('date.formatter')->format($this->revision->getRevisionCreationTime()),
     ]);
   }
 
@@ -92,7 +92,7 @@ class DateContentRevisionDeleteForm extends ConfirmFormBase {
     $this->DateContentDateContent->deleteRevision($this->revision->getRevisionId());
 
     $this->logger('content')->notice('Date Content: deleted %title revision %revision.', ['%title' => $this->revision->label(), '%revision' => $this->revision->getRevisionId()]);
-    $this->messenger()->addMessage(t('Revision from %revision-date of Date Content %title has been deleted.', ['%revision-date' => format_date($this->revision->getRevisionCreationTime()), '%title' => $this->revision->label()]));
+    $this->messenger()->addMessage(t('Revision from %revision-date of Date Content %title has been deleted.', ['%revision-date' => \Drupal::service('date.formatter')->format($this->revision->getRevisionCreationTime()), '%title' => $this->revision->label()]));
     $form_state->setRedirect(
       'entity.date_content.canonical',
        ['date_content' => $this->revision->id()]
diff --git a/src/Form/DateContentRevisionRevertForm.php b/src/Form/DateContentRevisionRevertForm.php
index 61f64d1..caf1d21 100644
--- a/src/Form/DateContentRevisionRevertForm.php
+++ b/src/Form/DateContentRevisionRevertForm.php
@@ -129,7 +129,7 @@ class DateContentRevisionRevertForm extends ConfirmFormBase {
   protected function prepareRevertedRevision(DateContentInterface $revision, FormStateInterface $form_state) {
     $revision->setNewRevision();
     $revision->isDefaultRevision(TRUE);
-    $revision->setRevisionCreationTime(REQUEST_TIME);
+    $revision->setRevisionCreationTime(\Drupal::time()->getRequestTime());
 
     return $revision;
   }
diff --git a/src/Form/DateContentRevisionRevertTranslationForm.php b/src/Form/DateContentRevisionRevertTranslationForm.php
index 8d830aa..86f7fe9 100644
--- a/src/Form/DateContentRevisionRevertTranslationForm.php
+++ b/src/Form/DateContentRevisionRevertTranslationForm.php
@@ -89,7 +89,7 @@ class DateContentRevisionRevertTranslationForm extends DateContentRevisionRevert
 
     $latest_revision_translation->setNewRevision();
     $latest_revision_translation->isDefaultRevision(TRUE);
-    $revision->setRevisionCreationTime(REQUEST_TIME);
+    $revision->setRevisionCreationTime(\Drupal::time()->getRequestTime());
 
     return $latest_revision_translation;
   }