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# \$1week
<a name="week"></a>

Amazon DocumentDB 中的`$week`运算符根据 ISO 8601 标准返回日期的周数 (0-53)。周数是根据年份和星期几计算的，星期一是一周的第一天。

**参数**

无

## 示例（MongoDB 外壳）
<a name="week-examples"></a>

以下示例演示如何使用`$week`运算符检索给定日期的星期数。

**创建示例文档**

```
db.events.insertMany([
  { _id: 1, date: new Date("2023-01-01") },
  { _id: 2, date: new Date("2023-01-08") },
  { _id: 3, date: new Date("2023-12-31") }
]);
```

**查询示例**

```
db.events.aggregate([
  { $project: {
    _id: 1,
    week: { $week: "$date" }
  }}
]);
```

**输出**

```
[
  { "_id": 1, "week": 1 },
  { "_id": 2, "week": 2 },
  { "_id": 3, "week": 53 }
]
```

## 代码示例
<a name="week-code"></a>

要查看使用该`$week`命令的代码示例，请选择要使用的语言的选项卡：

------
#### [ Node.js ]

```
const { MongoClient } = require('mongodb');

async function example() {
  const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
  const db = client.db('test');
  const events = db.collection('events');

  const result = await events.aggregate([
    { $project: {
      _id: 1,
      week: { $week: "$date" }
    }}
  ]).toArray();

  console.log(result);
  await client.close();
}

example();
```

------
#### [ Python ]

```
from pymongo import MongoClient

def example():
  client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
  db = client['test']
  events = db['events']

  result = list(events.aggregate([
      {'$project': {
          '_id': 1,
          'week': {'$week': '$date'}
      }}
  ]))

  print(result)

  client.close()

example()
```

------