我的MWS请求中的时间戳有什么问题?

如果我通过草稿板向MWS提交请求( AmazonServices/Scratchpad ), 它是成功的,我可以查看成功请求的详细信息。特别是,请求上的时间戳如下所示:

&Timestamp=2018-08-14T18%3A30%3A02Z

如果我按字面上的意思取下这个时间戳,并尝试在代码中使用它来做出相同的准确请求,我会得到一个错误:

<Message>Timestamp 2018-08-14T18%3A30%3A02Z must be in ISO8601 
format</Message>\n 

下面是我要放入的函数:(一些字符在敏感参数中发生了更改)

exports.sendRequest = () => {

  return agent
    .post('https://mws.amazonservices.com/Products/2011-10-01')
    .query({
      AWSAccessKeyId: encodeURIComponent('BINAJO5TPTZ5TTRLNGQA'),
      Action: encodeURIComponent('GetMatchingProductForId'),
      SellerId: encodeURIComponent('H1N1R958BK8TTH'),
      SignatureVersion: encodeURIComponent('2'),
      Timestamp: '2018-08-14T18%3A30%3A02Z',
      Version: encodeURIComponent('2011-10-01'),
      Signature: encodeURIComponent(exports.generateSignature()),
      SignatureMethod: encodeURIComponent('HmacSHA256'),
      MarketplaceId: encodeURIComponent('ATVPDKIKX0DER'),
      IdType: encodeURIComponent('UPC'),
      'IdList.Id.1': encodeURIComponent('043171884536')
    })
    .then(res => {
      console.log('here is the response');
      console.log(res)
    })
    .catch(error => {
      console.log('here is the error');
      console.log(error);
    })
} 

更奇怪的是,这是请求发送到的路径:

path: '/Products/2011-10-01? 

awsacesskeyid=binajo5zptz5ytpngqa&action=getmatchingproductforid&sellerid=h1n1r958et8thh&signatureReversion=2&timestamp=2018-08-14t18%253a30%253a02z&version=2011-10-01&signature=lwzn5of9nwcagoob0jhabymeqt31m6y93qhux0d%252bck8%253d&signaturemethod=hmacsha256&marketplaceid=atvpdkikx0der&idtype=upc&idlist.id.1=043171884536',

时间戳与我在查询中放置的时间戳不同。为什么会这样?