diff --git a/classes/studyplanservice.php b/classes/studyplanservice.php
index bfcea46..0bbc11f 100644
--- a/classes/studyplanservice.php
+++ b/classes/studyplanservice.php
@@ -1199,23 +1199,34 @@ class studyplanservice extends \external_api
          return success::structure();
      }
      public static function course_period_timing($page_id, $period, $course_id){
-        $page = studyplanpage::findById($page_id);
         $course = \get_course($course_id);
         $coursecontext = \context_course::instance($course_id);
+        $page = studyplanpage::findById($page_id);
         // Check for studyplan edit permissions
         webservicehelper::require_capabilities(self::CAP_EDIT,$page->studyplan()->context());
-        
-        if(webservicehelper::has_capabilities("moodle/course:update",$coursecontext)){
-            //TODO: Actually perform the timing changes, while also updating the module times
-            // Like what happens on a course "reset"
 
+        $periods = period::findForPage($page);
+        if(array_key_exists($period,$periods)){
+            $pstart = $periods[$period];
+            $pend = $periods[$period];
 
-            return success::success()->model();
-        } else {
-            // probably should return a nice message
-            return success::fail("You do not have date change permissions on this course")->model();
+            if(webservicehelper::has_capabilities("moodle/course:update",$coursecontext)){
+                // Actually perform the timing changes, while also updating the module times
+                // Like what happens on a course "reset"
+                $status = reset_course_userdata([
+                    'id' => $course->id,
+                    'reset_start_date' => $pstart->startdate()->getTimestamp(),
+                    'reset_end_date' => $pend->enddate()->getTimestamp(),
+                ]);
+
+                // TODO: parse status
+
+                return success::success()->model();
+            } else {
+                // probably should return a nice message
+                return success::fail("You do not have date change permissions on this course")->model();
+            }
         }
-
      }