diff --git a/core/config/schema/core.entity.schema.yml b/core/config/schema/core.entity.schema.yml
index 08a2646fcf..00b3697d37 100644
--- a/core/config/schema/core.entity.schema.yml
+++ b/core/config/schema/core.entity.schema.yml
@@ -357,6 +357,9 @@ field.formatter.settings.timestamp:
         granularity:
           type: integer
           label: 'Granularity'
+        refresh:
+          type: integer
+          label: 'Refresh interval in seconds'
 
 field.formatter.settings.timestamp_ago:
   type: mapping
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php
index d3712f31f4..c94cdaed78 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php
@@ -105,6 +105,7 @@ public static function defaultSettings() {
         'future_format' => '@interval hence',
         'past_format' => '@interval ago',
         'granularity' => 2,
+        'refresh' => 60,
       ],
     ] + parent::defaultSettings();
   }
@@ -198,6 +199,15 @@ public function settingsForm(array $form, FormStateInterface $form_state) {
       '#states' => $states,
     ];
 
+    $form['timeago']['refresh'] = [
+      '#type' => 'select',
+      '#title' => $this->t('Refresh interval (seconds)'),
+      '#description' => $this->t("The interval to refresh the displayed 'time ago'."),
+      '#default_value' => $timeago['refresh'],
+      '#options' => $this->getRefreshIntervals(),
+      '#states' => $states,
+    ];
+
     return $form;
   }
 
@@ -237,6 +247,11 @@ public function settingsSummary() {
       $interval = $this->dateFormatter->formatTimeDiffSince($timestamp, $options);
       $display = new FormattableMarkup($timeago['past_format'], ['@interval' => $interval]);
       $summary[] = $this->t('Past date: %display', ['%display' => $display]);
+
+      if ($timeago['refresh']) {
+        $refresh_intervals = $this->getRefreshIntervals();
+        $summary[] = $this->t('Refresh in @interval', ['@interval' => $refresh_intervals[$timeago['refresh']]]);
+      }
     }
 
     return $summary;
@@ -319,4 +334,22 @@ protected function buildStates(array $path, array $conditions) {
     ];
   }
 
+  /**
+   * Returns the refresh interval options for the jQuery 'time ago' display.
+   *
+   * @return array
+   *   A list of refresh time intervals.
+   */
+  protected function getRefreshIntervals() {
+    return [
+      0 => $this->t('No refresh'),
+      1 => $this->t('1 second'),
+      10 => $this->t('10 seconds'),
+      15 => $this->t('15 seconds'),
+      30 => $this->t('30 seconds'),
+      60 => $this->t('1 minute'),
+      300 => $this->t('5 minutes'),
+    ];
+  }
+
 }
diff --git a/core/misc/timeago.es6.js b/core/misc/timeago.es6.js
index 4cd3bdf36a..4e50746c31 100644
--- a/core/misc/timeago.es6.js
+++ b/core/misc/timeago.es6.js
@@ -14,25 +14,33 @@
    */
   Drupal.behaviors.timestampAsTimeAgo = {
     attach: function (context, settings) {
-      // @todo Refresh on an interval configurable via formatter settings.
       $('time.js-timeago')
         .once('timeago')
         .each(function () {
           var timestamp = (new Date($(this).attr('datetime'))).getTime();
           var timeagoSettings = JSON.parse(atob($(this).attr('data-drupal-timeago')));
-          var interval, format;
           var options = { granularity: timeagoSettings.granularity };
-          var now = Date.now();
+          var element = this;
 
-          if (timestamp > now) {
-            interval = Drupal.dateFormatter.formatDiff(now, timestamp, options);
-            format = timeagoSettings.future_format;
-          }
-          else {
-            interval = Drupal.dateFormatter.formatDiff(timestamp, now, options);
-            format = timeagoSettings.past_format;
+          var showTimeAgo = function () {
+            var interval, format;
+            now = Date.now();
+
+            if (timestamp > now) {
+              interval = Drupal.dateFormatter.formatDiff(now, timestamp, options);
+              format = timeagoSettings.future_format;
+            }
+            else {
+              interval = Drupal.dateFormatter.formatDiff(timestamp, now, options);
+              format = timeagoSettings.past_format;
+            }
+            $(element).text(Drupal.t(format, {'@interval': interval}));
+          };
+
+          showTimeAgo();
+          if (timeagoSettings.refresh > 0) {
+            setInterval(showTimeAgo, timeagoSettings.refresh * 1000);
           }
-          $(this).text(Drupal.t(format, {'@interval': interval}));
         })
     }
   };
@@ -93,7 +101,7 @@
             output.push(Drupal.formatPlural(units, '1 year', '@count years'));
             break;
           case 'month':
-            output.push(Drupal.formatPlural(units, '1 months', '@count months'));
+            output.push(Drupal.formatPlural(units, '1 month', '@count months'));
             break;
           case 'week':
             output.push(Drupal.formatPlural(units, '1 week', '@count weeks'));
diff --git a/core/misc/timeago.js b/core/misc/timeago.js
index 5a5015d7f4..8e99a41360 100644
--- a/core/misc/timeago.js
+++ b/core/misc/timeago.js
@@ -14,18 +14,27 @@
       $('time.js-timeago').once('timeago').each(function () {
         var timestamp = new Date($(this).attr('datetime')).getTime();
         var timeagoSettings = JSON.parse(atob($(this).attr('data-drupal-timeago')));
-        var interval, format;
         var options = { granularity: timeagoSettings.granularity };
-        var now = Date.now();
+        var element = this;
 
-        if (timestamp > now) {
-          interval = Drupal.dateFormatter.formatDiff(now, timestamp, options);
-          format = timeagoSettings.future_format;
-        } else {
-          interval = Drupal.dateFormatter.formatDiff(timestamp, now, options);
-          format = timeagoSettings.past_format;
+        var showTimeAgo = function showTimeAgo() {
+          var interval, format;
+          now = Date.now();
+
+          if (timestamp > now) {
+            interval = Drupal.dateFormatter.formatDiff(now, timestamp, options);
+            format = timeagoSettings.future_format;
+          } else {
+            interval = Drupal.dateFormatter.formatDiff(timestamp, now, options);
+            format = timeagoSettings.past_format;
+          }
+          $(element).text(Drupal.t(format, { '@interval': interval }));
+        };
+
+        showTimeAgo();
+        if (timeagoSettings.refresh > 0) {
+          setInterval(showTimeAgo, timeagoSettings.refresh * 1000);
         }
-        $(this).text(Drupal.t(format, { '@interval': interval }));
       });
     }
   };
@@ -64,7 +73,7 @@
             output.push(Drupal.formatPlural(units, '1 year', '@count years'));
             break;
           case 'month':
-            output.push(Drupal.formatPlural(units, '1 months', '@count months'));
+            output.push(Drupal.formatPlural(units, '1 month', '@count months'));
             break;
           case 'week':
             output.push(Drupal.formatPlural(units, '1 week', '@count weeks'));