diff --git a/mod/scorm/lang/en/scorm.php b/mod/scorm/lang/en/scorm.php
index 06c2e1c558c99..c6ad22ff722aa 100644
--- a/mod/scorm/lang/en/scorm.php
+++ b/mod/scorm/lang/en/scorm.php
@@ -297,6 +297,7 @@
 $string['not_corr_type'] = 'Type mismatch for tag {$a->tag}';
 $string['notopenyet'] = 'Sorry, this activity is not available until {$a}';
 $string['objectives'] = 'Objectives';
+$string['openafterclose'] = 'You have specified an open date after the close date';
 $string['optallstudents'] = 'all users';
 $string['optattemptsonly'] = 'users with attempts only';
 $string['optnoattemptsonly'] = 'users with no attempts only';
diff --git a/mod/scorm/lib.php b/mod/scorm/lib.php
index 2416be80fdf62..622b994517c6b 100644
--- a/mod/scorm/lib.php
+++ b/mod/scorm/lib.php
@@ -50,6 +50,9 @@
 define('SCORM_DISPLAY_ATTEMPTSTATUS_MY', 2);
 define('SCORM_DISPLAY_ATTEMPTSTATUS_ENTRY', 3);
 
+define('SCORM_EVENT_TYPE_OPEN', 'open');
+define('SCORM_EVENT_TYPE_CLOSE', 'close');
+
 /**
  * Return an array of status options
  *
@@ -1798,3 +1801,117 @@ function mod_scorm_get_completion_active_rule_descriptions($cm) {
     }
     return $descriptions;
 }
+
+/**
+ * This function will update the scorm module according to the
+ * event that has been modified.
+ *
+ * It will set the timeopen or timeclose value of the scorm instance
+ * according to the type of event provided.
+ *
+ * @throws \moodle_exception
+ * @param \calendar_event $event
+ * @param stdClass $scorm The module instance to get the range from
+ */
+function mod_scorm_core_calendar_event_timestart_updated(\calendar_event $event, \stdClass $scorm) {
+    global $DB;
+
+    if (empty($event->instance) || $event->modulename != 'scorm') {
+        return;
+    }
+
+    if ($event->instance != $scorm->id) {
+        return;
+    }
+
+    if (!in_array($event->eventtype, [SCORM_EVENT_TYPE_OPEN, SCORM_EVENT_TYPE_CLOSE])) {
+        return;
+    }
+
+    $courseid = $event->courseid;
+    $modulename = $event->modulename;
+    $instanceid = $event->instance;
+    $modified = false;
+
+    $coursemodule = get_fast_modinfo($courseid)->instances[$modulename][$instanceid];
+    $context = context_module::instance($coursemodule->id);
+
+    // The user does not have the capability to modify this activity.
+    if (!has_capability('moodle/course:manageactivities', $context)) {
+        return;
+    }
+
+    if ($event->eventtype == SCORM_EVENT_TYPE_OPEN) {
+        // If the event is for the scorm activity opening then we should
+        // set the start time of the scorm activity to be the new start
+        // time of the event.
+        if ($scorm->timeopen != $event->timestart) {
+            $scorm->timeopen = $event->timestart;
+            $scorm->timemodified = time();
+            $modified = true;
+        }
+    } else if ($event->eventtype == SCORM_EVENT_TYPE_CLOSE) {
+        // If the event is for the scorm activity closing then we should
+        // set the end time of the scorm activity to be the new start
+        // time of the event.
+        if ($scorm->timeclose != $event->timestart) {
+            $scorm->timeclose = $event->timestart;
+            $modified = true;
+        }
+    }
+
+    if ($modified) {
+        $scorm->timemodified = time();
+        $DB->update_record('scorm', $scorm);
+        $event = \core\event\course_module_updated::create_from_cm($coursemodule, $context);
+        $event->trigger();
+    }
+}
+
+/**
+ * This function calculates the minimum and maximum cutoff values for the timestart of
+ * the given event.
+ *
+ * It will return an array with two values, the first being the minimum cutoff value and
+ * the second being the maximum cutoff value. Either or both values can be null, which
+ * indicates there is no minimum or maximum, respectively.
+ *
+ * If a cutoff is required then the function must return an array containing the cutoff
+ * timestamp and error string to display to the user if the cutoff value is violated.
+ *
+ * A minimum and maximum cutoff return value will look like:
+ * [
+ *     [1505704373, 'The date must be after this date'],
+ *     [1506741172, 'The date must be before this date']
+ * ]
+ *
+ * @param \calendar_event $event The calendar event to get the time range for
+ * @param \stdClass $instance The module instance to get the range from
+ * @return array Returns an array with min and max date.
+ */
+function mod_scorm_core_calendar_get_valid_event_timestart_range(\calendar_event $event, \stdClass $instance) {
+    $mindate = null;
+    $maxdate = null;
+
+    if ($event->eventtype == SCORM_EVENT_TYPE_OPEN) {
+        // The start time of the open event can't be equal to or after the
+        // close time of the scorm activity.
+        if (!empty($instance->timeclose)) {
+            $maxdate = [
+                $instance->timeclose,
+                get_string('openafterclose', 'scorm')
+            ];
+        }
+    } else if ($event->eventtype == SCORM_EVENT_TYPE_CLOSE) {
+        // The start time of the close event can't be equal to or earlier than the
+        // open time of the scorm activity.
+        if (!empty($instance->timeopen)) {
+            $mindate = [
+                $instance->timeopen,
+                get_string('closebeforeopen', 'scorm')
+            ];
+        }
+    }
+
+    return [$mindate, $maxdate];
+}
\ No newline at end of file
diff --git a/mod/scorm/locallib.php b/mod/scorm/locallib.php
index 869de923df990..58fbc8aa54829 100644
--- a/mod/scorm/locallib.php
+++ b/mod/scorm/locallib.php
@@ -51,9 +51,6 @@
 define('TOCJSLINK', 1);
 define('TOCFULLURL', 2);
 
-define('SCORM_EVENT_TYPE_OPEN', 'open');
-define('SCORM_EVENT_TYPE_CLOSE', 'close');
-
 // Local Library of functions for module scorm.
 
 /**