datetime library change

Author: xixilele1990

ada-project-docs/wave_04.md

@@ -192,3 +192,11 @@ Send `PATCH` requests to `localhost:5000/tasks/<task_id>/mark_complete` (use the
 ![](assets/postman_patch.png)
 
 ![](assets/slack_notification_feature.png)
+
+
+
+The result show as below
+![](assets/lexy-slackbot.png)
+
+
+

app/routes/task_routes.py

@@ -2,7 +2,7 @@
 from flask import Blueprint, abort, make_response, request, Response,jsonify,current_app
 from ..db import db
 from .route_utilities import validate_model,create_model,get_models_with_filters
-from datetime import datetime
+from datetime import datetime,timezone
 import  requests,os
 
 bp = Blueprint("tasks_bp", __name__, url_prefix="/tasks")
@@ -129,7 +129,7 @@ def mark_task_complete(id):
     #task = Task.query.get(id)
 
 
-    task.completed_at = datetime.utcnow()
+    task.completed_at = datetime.now(timezone.utc)
     db.session.commit()