diff --git a/lms/djangoapps/instructor/tests/test_api.py b/lms/djangoapps/instructor/tests/test_api.py
index e8bcc81318da..51fc514c4879 100644
--- a/lms/djangoapps/instructor/tests/test_api.py
+++ b/lms/djangoapps/instructor/tests/test_api.py
@@ -4175,6 +4175,16 @@ def test_change_due_date_with_reason(self):
         # This operation regenerates the cache, so we can use cached results from edx-when.
         assert get_date_for_block(self.course, self.week1, self.user1, use_cached=True) == due_date
 
+    def test_reset_due_date_with_reason(self):
+        url = reverse('reset_due_date', kwargs={'course_id': str(self.course.id)})
+        response = self.client.post(url, {
+            'student': self.user1.username,
+            'url': str(self.week1.location),
+            'reason': 'Testing reason.'  # this is optional field.
+        })
+        assert response.status_code == 200
+        assert 'Successfully reset due date for student' in response.content.decode('utf-8')
+
     def test_change_to_invalid_due_date(self):
         url = reverse('change_due_date', kwargs={'course_id': str(self.course.id)})
         response = self.client.post(url, {
diff --git a/lms/djangoapps/instructor/views/api.py b/lms/djangoapps/instructor/views/api.py
index 58556ee9ab02..6978eaf3fe96 100644
--- a/lms/djangoapps/instructor/views/api.py
+++ b/lms/djangoapps/instructor/views/api.py
@@ -137,7 +137,6 @@
     handle_dashboard_error,
     keep_field_private,
     parse_datetime,
-    require_student_from_identifier,
     set_due_date_extension,
     strip_if_string,
 )
@@ -3035,37 +3034,59 @@ def post(self, request, course_id):
                              due_date.strftime('%Y-%m-%d %H:%M')))
 
 
-@handle_dashboard_error
-@require_POST
-@ensure_csrf_cookie
-@cache_control(no_cache=True, no_store=True, must_revalidate=True)
-@require_course_permission(permissions.GIVE_STUDENT_EXTENSION)
-@require_post_params('student', 'url')
-def reset_due_date(request, course_id):
+@method_decorator(cache_control(no_cache=True, no_store=True, must_revalidate=True), name='dispatch')
+class ResetDueDate(APIView):
     """
     Rescinds a due date extension for a student on a particular unit.
     """
-    course = get_course_by_id(CourseKey.from_string(course_id))
-    student = require_student_from_identifier(request.POST.get('student'))
-    unit = find_unit(course, request.POST.get('url'))
-    reason = strip_tags(request.POST.get('reason', ''))
+    permission_classes = (IsAuthenticated, permissions.InstructorPermission)
+    permission_name = permissions.GIVE_STUDENT_EXTENSION
+    serializer_class = BlockDueDateSerializer
 
-    version = getattr(course, 'course_version', None)
+    @method_decorator(ensure_csrf_cookie)
+    def post(self, request, course_id):
+        """
+        reset a due date extension to a student for a particular unit.
+        params:
+            url (str): The URL related to the block that needs the due date update.
+            student (str): The email or username of the student whose access is being modified.
+            reason (str): Optional param.
+        """
+        serializer_data = self.serializer_class(data=request.data, context={'disable_due_datetime': True})
+        if not serializer_data.is_valid():
+            return HttpResponseBadRequest(reason=serializer_data.errors)
 
-    original_due_date = get_date_for_block(course_id, unit.location, published_version=version)
+        student = serializer_data.validated_data.get('student')
+        if not student:
+            response_payload = {
+                'error': f'Could not find student matching identifier: {request.data.get("student")}'
+            }
+            return JsonResponse(response_payload)
 
-    set_due_date_extension(course, unit, student, None, request.user, reason=reason)
-    if not original_due_date:
-        # It's possible the normal due date was deleted after an extension was granted:
-        return JsonResponse(
-            _("Successfully removed invalid due date extension (unit has no due date).")
-        )
+        course = get_course_by_id(CourseKey.from_string(course_id))
+        unit = find_unit(course, serializer_data.validated_data.get('url'))
+        reason = strip_tags(serializer_data.validated_data.get('reason', ''))
+
+        version = getattr(course, 'course_version', None)
+
+        original_due_date = get_date_for_block(course_id, unit.location, published_version=version)
 
-    original_due_date_str = original_due_date.strftime('%Y-%m-%d %H:%M')
-    return JsonResponse(_(
-        'Successfully reset due date for student {0} for {1} '
-        'to {2}').format(student.profile.name, _display_unit(unit),
-                         original_due_date_str))
+        try:
+            set_due_date_extension(course, unit, student, None, request.user, reason=reason)
+            if not original_due_date:
+                # It's possible the normal due date was deleted after an extension was granted:
+                return JsonResponse(
+                    _("Successfully removed invalid due date extension (unit has no due date).")
+                )
+
+            original_due_date_str = original_due_date.strftime('%Y-%m-%d %H:%M')
+            return JsonResponse(_(
+                'Successfully reset due date for student {0} for {1} '
+                'to {2}').format(student.profile.name, _display_unit(unit),
+                                 original_due_date_str))
+
+        except Exception as error:  # pylint: disable=broad-except
+            return JsonResponse({'error': str(error)}, status=400)
 
 
 @handle_dashboard_error
diff --git a/lms/djangoapps/instructor/views/api_urls.py b/lms/djangoapps/instructor/views/api_urls.py
index 9c0939a1c1b8..a248b46ae531 100644
--- a/lms/djangoapps/instructor/views/api_urls.py
+++ b/lms/djangoapps/instructor/views/api_urls.py
@@ -51,7 +51,7 @@
     path('update_forum_role_membership', api.update_forum_role_membership, name='update_forum_role_membership'),
     path('change_due_date', api.ChangeDueDate.as_view(), name='change_due_date'),
     path('send_email', api.SendEmail.as_view(), name='send_email'),
-    path('reset_due_date', api.reset_due_date, name='reset_due_date'),
+    path('reset_due_date', api.ResetDueDate.as_view(), name='reset_due_date'),
     path('show_unit_extensions', api.show_unit_extensions, name='show_unit_extensions'),
     path('show_student_extensions', api.ShowStudentExtensions.as_view(), name='show_student_extensions'),
 
diff --git a/lms/djangoapps/instructor/views/serializer.py b/lms/djangoapps/instructor/views/serializer.py
index da91eba43124..5d123ad66c81 100644
--- a/lms/djangoapps/instructor/views/serializer.py
+++ b/lms/djangoapps/instructor/views/serializer.py
@@ -215,3 +215,10 @@ def validate_student(self, value):
             return None
 
         return user
+
+    def __init__(self, *args, **kwargs):
+        # Get context to check if `due_datetime` should be optional
+        disable_due_datetime = kwargs.get('context', {}).get('disable_due_datetime', False)
+        super().__init__(*args, **kwargs)
+        if disable_due_datetime:
+            self.fields['due_datetime'].required = False