DynamoDB查询ISO日期

Question

我是Dynamo的新手，一直在尝试查询数据库的范围。

我正在这样查询Lambda中的ISO日期字符串：

  const start = event['queryStringParameters']['startDate'];
  const end = event['queryStringParameters']['endDate'];
  
  let params = {
    TableName: "Parcel",
    KeyConditionExpression: "#trackNo = :trackNo AND #ShipmentDate BETWEEN :start AND :end",
    ExpressionAttributeNames: {
      "#trackNo": "TrackingNumber",
      "#ShipmentDate": "ShipmentDate"
    },
    ExpressionAttributeValues: {
      ":trackNo": "TrackingNumber",
      ":start": start,
      ":end": end
    }

但是我没有得到该范围内的任何记录...

我已经搜索了几个小时...我不知道如何执行此查询。

示例数据：

{
  "Carrier": "FedEx",
  "ShipmentDate": "2019-09-02",
  "TrackingNumber": "TN_2019-09-02"
}

功能扫描范例：

  let params = {
    TableName: "Parcel",
    FilterExpression: "#ShipmentDate BETWEEN :start AND :end",
    ExpressionAttributeNames: {
      "#ShipmentDate": "ShipmentDate"
    },
    ExpressionAttributeValues: {
      ":start": start,
      ":end": end
    }
};

  try {
    const data = await documentClient.scan(params).promise();
    responseBody = JSON.stringify(data);
    
    statusCode = 200;
  } catch (err) {
    responseBody = `Unable to get shipments: ${err}`
    statusCode = 403;
  }