Add UTC current time to response

main.py

@@ -1,8 +1,13 @@
 from fastapi import FastAPI, Request
+from datetime import datetime, timezone
 
 app = FastAPI()
 
 @app.get("/")
 async def read_root(request: Request):
     client_host = request.client.host
-    return {"message": "ハローワールド！！", "client_ip": client_host}
+    return {
+        "message": "ハローワールド！！",
+        "client_ip": client_host,
+        "current_time_utc": datetime.now(timezone.utc).isoformat()
+    }