diff --git a/src/LtiGrade.php b/src/LtiGrade.php
index 4d17e348..153cddfb 100644
--- a/src/LtiGrade.php
+++ b/src/LtiGrade.php
@@ -16,6 +16,7 @@ class LtiGrade
     private $user_id;
     private $submission_review;
     private $canvas_extension;
+    private $submission;
 
     public function __construct(?array $grade = null)
     {
@@ -28,6 +29,7 @@ public function __construct(?array $grade = null)
         $this->user_id = $grade['userId'] ?? null;
         $this->submission_review = $grade['submissionReview'] ?? null;
         $this->canvas_extension = $grade['https://canvas.instructure.com/lti/submission'] ?? null;
+        $this->submission = $grade['submission'] ?? null;
     }
 
     public function getArray(): array
@@ -42,6 +44,7 @@ public function getArray(): array
             'userId' => $this->user_id,
             'submissionReview' => $this->submission_review,
             'https://canvas.instructure.com/lti/submission' => $this->canvas_extension,
+            'submission' => $this->submission,
         ];
     }
 
@@ -169,4 +172,24 @@ public function setCanvasExtension($value): self
 
         return $this;
     }
+
+    /**
+     * @return array{startedAt?: ?string, submittedAt?: ?string}|null
+     */
+    public function getSubmission()
+    {
+        return $this->submission;
+    }
+
+    /**
+     * @param  array{startedAt?: ?string, submittedAt?: ?string}  $value
+     *
+     * @see https://www.imsglobal.org/spec/lti-ags/v2p0
+     */
+    public function setSubmission($value): self
+    {
+        $this->submission = $value;
+
+        return $this;
+    }
 }
diff --git a/tests/LtiGradeTest.php b/tests/LtiGradeTest.php
index 1635b493..374e2f13 100644
--- a/tests/LtiGradeTest.php
+++ b/tests/LtiGradeTest.php
@@ -207,6 +207,10 @@ public function test_it_casts_full_object_to_string()
             'userId' => 'UserId',
             'submissionReview' => 'SubmissionReview',
             'https://canvas.instructure.com/lti/submission' => 'CanvasExtension',
+            'submission' => [
+                'startedAt' => '2023-01-15T12:30:45Z',
+                'submittedAt' => '2023-01-15T13:15:22Z',
+            ],
         ];
 
         $grade = new LtiGrade($expected);
@@ -226,6 +230,10 @@ public function test_it_casts_full_object_to_string_with0_grade()
             'userId' => 'UserId',
             'submissionReview' => 'SubmissionReview',
             'https://canvas.instructure.com/lti/submission' => 'CanvasExtension',
+            'submission' => [
+                'startedAt' => '2023-01-15T12:30:45Z',
+                'submittedAt' => '2023-01-15T13:15:22Z',
+            ],
         ];
 
         $grade = new LtiGrade($expected);
@@ -237,4 +245,30 @@ public function test_it_casts_empty_object_to_string()
     {
         $this->assertEquals('[]', (string) $this->grade);
     }
+
+    public function test_it_gets_submission()
+    {
+        $expected = [
+            'startedAt' => '2023-01-15T12:30:45Z',
+            'submittedAt' => '2023-01-15T13:15:22Z',
+        ];
+        $grade = new LtiGrade(['submission' => $expected]);
+
+        $result = $grade->getSubmission();
+
+        $this->assertEquals($expected, $result);
+    }
+
+    public function test_it_sets_submission()
+    {
+        $expected = [
+            'startedAt' => '2023-01-15T12:30:45Z',
+            'submittedAt' => '2023-01-15T13:15:22Z',
+        ];
+
+        $this->grade->setSubmission($expected);
+
+        $this->assertEquals($expected, $this->grade->getSubmission());
+    }
+
 }