diff --git a/mod/feedback/classes/output/summary.php b/mod/feedback/classes/output/summary.php
index de3315cb056..5beda91033e 100644
--- a/mod/feedback/classes/output/summary.php
+++ b/mod/feedback/classes/output/summary.php
@@ -46,20 +46,20 @@ class summary implements renderable, templatable {
     /** @var int */
     protected $mygroupid;
 
-    /** @var bool  */
-    protected $extradetails;
-
     /**
      * Constructor.
      *
+     * @todo MDL-71494 Final deprecation of the $extradetails parameter in Moodle 4.3
      * @param mod_feedback_structure $feedbackstructure
      * @param int $mygroupid currently selected group
-     * @param bool $extradetails display additional details (time open, time closed)
+     * @param bool|null $extradetails Deprecated
      */
-    public function __construct($feedbackstructure, $mygroupid = false, $extradetails = false) {
+    public function __construct($feedbackstructure, $mygroupid = false, $extradetails = null) {
+        if (isset($extradetails)) {
+            debugging('The $extradetails parameter is deprecated.', DEBUG_DEVELOPER);
+        }
         $this->feedbackstructure = $feedbackstructure;
         $this->mygroupid = $mygroupid;
-        $this->extradetails = $extradetails;
     }
 
     /**
@@ -72,12 +72,6 @@ class summary implements renderable, templatable {
         $r = new stdClass();
         $r->completedcount = $this->feedbackstructure->count_completed_responses($this->mygroupid);
         $r->itemscount = count($this->feedbackstructure->get_items(true));
-        if ($this->extradetails && ($timeopen = $this->feedbackstructure->get_feedback()->timeopen)) {
-            $r->timeopen = userdate($timeopen);
-        }
-        if ($this->extradetails && ($timeclose = $this->feedbackstructure->get_feedback()->timeclose)) {
-            $r->timeclose = userdate($timeclose);
-        }
 
         return $r;
     }
diff --git a/mod/feedback/templates/summary.mustache b/mod/feedback/templates/summary.mustache
index b0e46f6bb7a..4c4f0f9970b 100644
--- a/mod/feedback/templates/summary.mustache
+++ b/mod/feedback/templates/summary.mustache
@@ -31,8 +31,7 @@
     Example context (json):
     {
         "completedcount" : 15,
-        "itemscount" : 5,
-        "timeopen" : "May 15, 2016"
+        "itemscount" : 5
     }
 
 }}
@@ -48,20 +47,3 @@
         class="feedback_info">{{#str}}questions, mod_feedback{{/str}}: </span><span
         class="feedback_info_value">{{itemscount}}</span>
 </div>
-
-{{#timeopen}}
-    <div class="feedback_info">
-        <span
-            class="feedback_info">{{#str}}feedbackopen, mod_feedback{{/str}}: </span><span
-            class="feedback_info_value">{{timeopen}}</span>
-    </div>
-{{/timeopen}}
-
-{{#timeclose}}
-    <div class="feedback_info">
-        <span
-            class="feedback_info">{{#str}}feedbackclose, mod_feedback{{/str}}: </span><span
-            class="feedback_info_value">{{timeclose}}</span>
-    </div>
-{{/timeclose}}
-
diff --git a/mod/feedback/upgrade.txt b/mod/feedback/upgrade.txt
index c9a0ef6877f..2e443379ee8 100644
--- a/mod/feedback/upgrade.txt
+++ b/mod/feedback/upgrade.txt
@@ -1,3 +1,6 @@
+=== 3.11 ===
+The $extradetails parameter in the constructor of the mod_feedback\output\summary class has been deprecated and is not used anymore.
+
 === 3.8 ===
 
 * The following functions have been finally deprecated and can not be used anymore:
diff --git a/mod/feedback/view.php b/mod/feedback/view.php
index a8e10192c18..42d41d08ed7 100644
--- a/mod/feedback/view.php
+++ b/mod/feedback/view.php
@@ -102,7 +102,7 @@ if (has_capability('mod/feedback:edititems', $context)) {
     $mygroupid = groups_get_activity_group($cm);
 
     echo $groupselect.'<div class="clearer">&nbsp;</div>';
-    $summary = new mod_feedback\output\summary($feedbackcompletion, $mygroupid, true);
+    $summary = new mod_feedback\output\summary($feedbackcompletion, $mygroupid);
     echo $OUTPUT->render_from_template('mod_feedback/summary', $summary->export_for_template($OUTPUT));
 
     if ($pageaftersubmit = $feedbackcompletion->page_after_submit()) {