diff --git a/main/inc/lib/extra_field.lib.php b/main/inc/lib/extra_field.lib.php
index 39d59d571a..4d9ab35368 100755
--- a/main/inc/lib/extra_field.lib.php
+++ b/main/inc/lib/extra_field.lib.php
@@ -1239,7 +1239,10 @@ class ExtraField extends Model
                             $field_details['display_text']
                         );
 
-                        $defaults['extra_'.$field_details['variable']] = api_get_local_time();
+                        $defaults = [];
+                        if (EntityExtraField::LP_ITEM_FIELD_TYPE !== (int) $field_details['extra_field_type']) {
+                            $defaults['extra_'.$field_details['variable']] = api_get_local_time();
+                        }
                         if (!isset($form->_defaultValues['extra_'.$field_details['variable']])) {
                             $form->setDefaults($defaults);
                         }
diff --git a/main/inc/lib/extra_field_value.lib.php b/main/inc/lib/extra_field_value.lib.php
index b75d924f8e..b7b3e38b2b 100755
--- a/main/inc/lib/extra_field_value.lib.php
+++ b/main/inc/lib/extra_field_value.lib.php
@@ -391,6 +391,9 @@ class ExtraFieldValue extends Model
                 case ExtraField::FIELD_TYPE_DATETIME:
                     $d = DateTime::createFromFormat('Y-m-d H:i', $value);
                     $valid = $d && $d->format('Y-m-d H:i') === $value;
+                    if (!$valid && EntityExtraField::LP_ITEM_FIELD_TYPE === (int) $extraFieldInfo['extra_field_type']) {
+                        $valid = empty($value);
+                    }
                     if ($valid) {
                         $newParams = [
                             'item_id' => $params['item_id'],
diff --git a/main/lp/blank.php b/main/lp/blank.php
index efbd04054d..2b2ba10695 100755
--- a/main/lp/blank.php
+++ b/main/lp/blank.php
@@ -34,6 +34,17 @@ if (isset($_GET['error'])) {
                 $message = Display::return_message(Security::remove_XSS($prerequisiteMessage), 'warning');
             }
 
+            // Validates and display error message for prerequisite dates.
+            /** @var learnpath $lp */
+            $lp = Session::read('oLP');
+            $itemId = $lp->get_current_item_id();
+            $datesMatch = $lp->prerequistesDatesMatch($itemId);
+            if (!$datesMatch) {
+                $currentItem = $lp->getItem($itemId);
+                if (!empty($currentItem->prereq_alert)) {
+                    $message = Display::return_message($currentItem->prereq_alert, 'warning');
+                }
+            }
             break;
         case 'document_not_found':
             $message = Display::return_message(get_lang('FileNotFound'), 'warning');
diff --git a/main/lp/learnpath.class.php b/main/lp/learnpath.class.php
index f8dc557395..3ef82bb510 100755
--- a/main/lp/learnpath.class.php
+++ b/main/lp/learnpath.class.php
@@ -4463,19 +4463,30 @@ class learnpath
                 'end_date'
             );
 
-            $result = true;
-            if (
-                !empty($startDate) && isset($startDate['value']) && !empty($startDate['value']) &&
-                !empty($endDate) && isset($endDate['value']) && !empty($endDate['value'])
+            $now = time();
+            $start = !empty($startDate['value']) ? api_strtotime($startDate['value']) : 0;
+            $end = !empty($endDate['value']) ? api_strtotime($endDate['value']) : 0;
+            $result = false;
+
+            if (($start == 0 && $end == 0) ||
+                (($start > 0 && $end == 0) && $now > $start) ||
+                (($start == 0 && $end > 0) && $now < $end) ||
+                (($start > 0 && $end > 0) && ($now > $start && $now < $end))
             ) {
-                $now = time();
-                $start = api_strtotime($startDate['value']);
-                $end = api_strtotime($endDate['value']);
-                $result = ($now > $start && $now < $end);
+                $result = true;
             }
 
             if (!$result) {
-                $this->set_error_msg(get_lang('ItemCanNotBeAccessedPrerequisiteDates'));
+                $errMsg = get_lang('ItemCanNotBeAccessedPrerequisiteDates');
+                if ($start > 0 && $start > $now) {
+                    $errMsg = get_lang('AccessibleFrom').' '.api_format_date($start, DATE_TIME_FORMAT_LONG);
+                }
+                if ($end > 0 && $end < $now) {
+                    $errMsg = get_lang('NoMoreAccessible');
+                }
+                $this->set_error_msg($errMsg);
+                $currentItem = $this->getItem($itemId);
+                $currentItem->prereq_alert = $errMsg;
             }
 
             return $result;
@@ -10247,7 +10258,7 @@ class learnpath
         $form->addHidden('type', TOOL_STUDENTPUBLICATION);
         $form->addHidden('post_time', time());
         $this->setAuthorLpItem($form);
-        $form->setDefaults(['title' => $item_title]);
+        $form->setDefaults(['title' => $item_title, 'start_date' => null]);
 
         $return = '<div class="sectioncomment">';
         $return .= $form->returnForm();
diff --git a/main/lp/lp_controller.php b/main/lp/lp_controller.php
index 7281a08ab0..cd8bd84f6c 100755
--- a/main/lp/lp_controller.php
+++ b/main/lp/lp_controller.php
@@ -907,6 +907,32 @@ switch ($action) {
                 $maxTimeAllowed = isset($_POST['maxTimeAllowed']) ? $_POST['maxTimeAllowed'] : '';
                 $url = isset($_POST['url']) ? $_POST['url'] : '';
 
+                // form validations after submit.
+                $error = false;
+                $errMsg = '';
+                if (true === api_get_configuration_value('lp_item_prerequisite_dates')) {
+                    if (!isset($_POST['extra_start_date'])) {
+                        $_POST['extra_start_date'] = 0;
+                    }
+                    if (!isset($_POST['extra_end_date'])) {
+                        $_POST['extra_end_date'] = 0;
+                    }
+                    $extraStartDate = $_POST['extra_start_date'];
+                    $extraEndDate = $_POST['extra_end_date'];
+                    if (!empty($extraStartDate) && !empty($extraEndDate)) {
+                        $error = !(strtotime($extraEndDate) >= strtotime($extraStartDate));
+                    }
+                    if ($error) {
+                        $errMsg = get_lang('StartDateMustBeBeforeTheEndDate');
+                    }
+                }
+
+                if ($error) {
+                    Display::addFlash(Display::return_message($errMsg, 'error'));
+                    header('Location: '.api_request_uri());
+                    exit;
+                }
+
                 $_SESSION['oLP']->edit_item(
                     $_REQUEST['id'],
                     $_POST['parent'],