diff -u b/core/lib/Drupal/Core/Datetime/Element/Datetime.php b/core/lib/Drupal/Core/Datetime/Element/Datetime.php
--- b/core/lib/Drupal/Core/Datetime/Element/Datetime.php
+++ b/core/lib/Drupal/Core/Datetime/Element/Datetime.php
@@ -391,9 +391,9 @@
    *
    * @return string
    *
-   * @deprecated in Drupal 8.6.x and will be removed before Drupal 9.0.0.
-   *   HTML date input format should not be exposed to users, as browser widgets
-   *   expose input differently, varying by vendor, locale, device type, etc.
+   * @deprecated in drupal:9.4.0 and is removed from drupal:10.0.0. HTML date
+   *   input format should not be exposed to users, as browser widgets expose
+   *   input differently, varying by vendor, locale, device type, etc.
    */
   public static function formatExample($format) {
     if (!static::$dateExample) {