diff --git a/core/lib/Drupal/Component/Utility/Xss.php b/core/lib/Drupal/Component/Utility/Xss.php
index ca146b1833d34bdfc32bd921bd649422620ee92c..1b8cfff943b680703cdfca8dd6767ee4391a8ada 100644
--- a/core/lib/Drupal/Component/Utility/Xss.php
+++ b/core/lib/Drupal/Component/Utility/Xss.php
@@ -238,6 +238,7 @@ protected static function attributes($attributes) {
               'rel',
               'property',
               'class',
+              'datetime',
             ]);
 
             $working = $mode = 1;
diff --git a/core/tests/Drupal/Tests/Component/Utility/XssTest.php b/core/tests/Drupal/Tests/Component/Utility/XssTest.php
index 43177b3722b3683b5690115210d63e53bc07a0d5..5182a44b84fe59b39687523a992bb910fa76668b 100644
--- a/core/tests/Drupal/Tests/Component/Utility/XssTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/XssTest.php
@@ -543,6 +543,24 @@ public function providerTestAttributes() {
         'Image tag with malformed SRC',
         ['img'],
       ],
+      [
+        '<del datetime="1789-08-22T12:30:00.1-04:00">deleted text</del>',
+        '<del datetime="1789-08-22T12:30:00.1-04:00">deleted text</del>',
+        'Del with datetime attribute',
+        ['del'],
+      ],
+      [
+        '<ins datetime="1986-01-28 11:38:00.010">inserted text</ins>',
+        '<ins datetime="1986-01-28 11:38:00.010">inserted text</ins>',
+        'Ins with datetime attribute',
+        ['ins'],
+      ],
+      [
+        '<time datetime="1978-11-19T05:00:00Z">#DBD</time>',
+        '<time datetime="1978-11-19T05:00:00Z">#DBD</time>',
+        'Time with datetime attribute',
+        ['time'],
+      ],
     ];
   }