diff --git a/mod/scorm/lang/en/scorm.php b/mod/scorm/lang/en/scorm.php
index bfecc0730c5..8b2d014d9b4 100644
--- a/mod/scorm/lang/en/scorm.php
+++ b/mod/scorm/lang/en/scorm.php
@@ -74,6 +74,7 @@ $string['browserepository'] = 'Browse repository';
 $string['calculatedweight'] = 'Calculated weight';
 $string['cannotaccess'] = 'You cannot call this script in that way';
 $string['cannotfindsco'] = 'Could not find SCO';
+$string['closebeforeopen'] = 'You have specified a close date before the open date.';
 $string['collapsetocwinsize'] = 'Collapse TOC when window size below';
 $string['collapsetocwinsizedesc'] = 'This setting lets you specify the window size below which the TOC should automatically collapse.';
 $string['compatibilitysettings'] = 'Compatibility settings';
diff --git a/mod/scorm/mod_form.php b/mod/scorm/mod_form.php
index 5039646145b..4b00473fc3a 100644
--- a/mod/scorm/mod_form.php
+++ b/mod/scorm/mod_form.php
@@ -442,6 +442,13 @@ class mod_scorm_mod_form extends moodleform_mod {
 
         }
 
+        // Validate availability dates.
+        if ($data['timeopen'] && $data['timeclose']) {
+            if ($data['timeopen'] > $data['timeclose']) {
+                $errors['timeclose'] = get_string('closebeforeopen', 'scorm');
+            }
+        }
+
         return $errors;
     }