Update app.py

app.py

@@ -238,7 +238,7 @@ async def screenshot(req: ScreenshotRequest):
             png = await sess["playwright_page"].screenshot(full_page=req.full_page)
         # Convert to base64
         b64 = base64.b64encode(png).decode()
-        return {"screenshot": b64, "format": "png", "timestamp": dt.utcnow().isoformat()}
+        return {"screenshot": b64, "format": "png", "timestamp": dt.now().isoformat()}
     except Exception as e:
         logger.error(f"Error taking screenshot: {e}")
         raise HTTPException(status_code=500, detail=str(e))