diff --git a/db/services.php b/db/services.php
index 4308a8f..dae064f 100644
--- a/db/services.php
+++ b/db/services.php
@@ -95,6 +95,14 @@
         'description' => 'Get Markers feedbacks',
         'capabilities'  => 'mod/assign:view',
         'type' => 'read',
+    ],
+    'api_ext_update_assessment' => [
+        'classname' => 'api_extend',
+        'methodname' => 'update_assessment',
+        'classpath' => 'local/api_extend/externallib.php',
+        'description' => 'Update Course Assessment',
+        'capabilities'  => 'moodle/course:update',
+        'type' => 'write',
     ]
 ];
 
diff --git a/externallib.php b/externallib.php
index bc76cd7..6bcd2d9 100644
--- a/externallib.php
+++ b/externallib.php
@@ -702,4 +702,81 @@ public static function get_markers_feedback_returns(): external_multiple_structu
         );
     }
 
+
+
+    /**
+     * Returns description of method parameters
+     *
+     * @return external_function_parameters
+     */
+    public static function update_assessment_parameters()
+    {
+        return new external_function_parameters([
+            'instanceid' => new external_value(PARAM_INT, 'The assignment id'),
+            'courseid' => new external_value(PARAM_INT, 'The course id'),
+            'duedate' => new external_value(PARAM_INT, 'The due date')
+        ]);
+    }
+
+    /**
+     * Update Course Assessment
+     *
+     * @param $instanceid
+     * @param $courseid
+     * @param $duedate
+     * @return array | false
+     * @throws dml_exception
+     * @throws invalid_parameter_exception
+     * @throws required_capability_exception
+     */
+    public static function update_assessment($instanceid, $courseid, $duedate)
+    {
+        global $DB;
+
+        //Parameter validation
+        $params = self::validate_parameters(
+            self::update_assessment_parameters(),
+            [
+                'instanceid' => $instanceid,
+                'courseid' => $courseid,
+                'duedate' => $duedate,
+            ]
+        );
+
+        $context = context_system::instance();
+        require_capability('moodle/course:update', $context);
+
+        $sql = "SELECT a.id
+                  FROM {assign} a
+                 WHERE a.id = :id AND a.course = :courseid";
+
+        $record = $DB->get_record_sql($sql, ['id' => $params['instanceid'], 'courseid' => $params['courseid']], MUST_EXIST);
+
+        if(empty($record)) {
+            return false;
+        }
+
+        $rec = new stdclass();
+        $rec->id = $record->id;
+        $rec->duedate = $duedate;
+
+        $DB->update_record('assign', $rec);
+
+        return (array)$record;
+
+    }
+
+    /**
+     * Returns description of method result value
+     *
+     * @return external_single_structure
+     */
+    public static function update_assessment_returns(): external_single_structure
+    {
+        return new external_single_structure(
+            [
+                'id' => new external_value(PARAM_INT, 'The course assessment id'),
+            ]
+        );
+    }
 }
diff --git a/version.php b/version.php
index 93ff48b..ac89bc4 100644
--- a/version.php
+++ b/version.php
@@ -22,7 +22,7 @@
 
 defined('MOODLE_INTERNAL') || die;
 
-$plugin->version  = 2022111400;
+$plugin->version  = 2022120700;
 $plugin->requires = 2018051700;  // Requires this Moodle version - at least 2.0
 $plugin->component = 'local_api_extend';
 $plugin->release = '0.2';