diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 015b517d51b80ea86b26ab3716e3d74458246161..08ad960625626e9baa20237f594395f7ebaa80f5 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -826,7 +826,9 @@ function drupal_render_inline_template(&$element) {
  */
 
 /**
- * Preprocess variables for theme_datetime().
+ * Prepares variables for time templates.
+ *
+ * Default template: time.html.twig.
  *
  * @param array $variables
  *   An associative array possibly containing:
@@ -834,7 +836,7 @@ function drupal_render_inline_template(&$element) {
  *   - timestamp:
  *   - text:
  */
-function template_preprocess_datetime(&$variables) {
+function template_preprocess_time(&$variables) {
   // Format the 'datetime' attribute based on the timestamp.
   // @see http://www.w3.org/TR/html5-author/the-time-element.html#attr-time-datetime
   if (!isset($variables['attributes']['datetime']) && isset($variables['timestamp'])) {
@@ -2350,9 +2352,9 @@ function drupal_common_theme() {
       'render element' => 'elements',
       'template' => 'region',
     ),
-    'datetime' => array(
+    'time' => array(
       'variables' => array('timestamp' => NULL, 'text' => NULL, 'attributes' => array(), 'html' => FALSE),
-      'template' => 'datetime',
+      'template' => 'time',
     ),
     'status_messages' => array(
       'variables' => array('display' => NULL),
diff --git a/core/modules/aggregator/aggregator.theme.inc b/core/modules/aggregator/aggregator.theme.inc
index 1335ee61b8efd6636e9f50b074c8d4c3e5d61d30..605025c10b75f78bd24d8788eae530a6915f423a 100644
--- a/core/modules/aggregator/aggregator.theme.inc
+++ b/core/modules/aggregator/aggregator.theme.inc
@@ -116,7 +116,7 @@ function template_preprocess_aggregator_summary_item(&$variables) {
     ),
   ));
   $variables['age'] = array(
-    '#theme' => 'datetime',
+    '#theme' => 'time',
     '#attributes' => array(
       'datetime' => format_date($item->getPostedTime(), 'html_datetime', '', 'UTC'),
       'class' => array('feed-item-age',),
diff --git a/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeDefaultFormatter.php b/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeDefaultFormatter.php
index 65167b34178f5a6d0f41de1af2343ff0ecd54d53..f983c8d8fa6e7bb72878f47e075828acae6ddb34 100644
--- a/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeDefaultFormatter.php
+++ b/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeDefaultFormatter.php
@@ -127,7 +127,7 @@ public function viewElements(FieldItemListInterface $items) {
 
       // Display the date using theme datetime.
       $elements[$delta] = array(
-        '#theme' => 'datetime',
+        '#theme' => 'time',
         '#text' => $formatted_date,
         '#html' => FALSE,
         '#attributes' => array(
diff --git a/core/modules/system/templates/datetime.html.twig b/core/modules/system/templates/time.html.twig
similarity index 100%
rename from core/modules/system/templates/datetime.html.twig
rename to core/modules/system/templates/time.html.twig