Why doesn’t @date appear in the JSON response from the Google Docs API?

I’m working with the Google Docs API to retrieve the contents of a document.

Used documents.get with the correct documentId and retrieved the document body. The JSON response does not include the @date in it.

Is there a way to get @date in the JSON response?

{
  "startIndex": 1,
  "endIndex": 3,
  "paragraph": {
    "elements": [
      {
        "startIndex": 1,
        "endIndex": 3,
        "textRun": {
          "content": "\n",
          "textStyle": {}
        }
      }
    ],
    "paragraphStyle": {
      "namedStyleType": "NORMAL_TEXT",
      "direction": "LEFT_TO_RIGHT"
    }
  }
}

This is the response that I am getting.

I see that I need to use export feature of google drive to get the doc in pdf or txt to get the date.