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

Amazon DocumentDB 中的`$week`運算子會根據 ISO 8601 標準傳回日期的週數 (0-53)。週數是根據年份和星期幾計算，而星期一是星期第一天。

**參數**

無

## 範例 (MongoDB Shell)
<a name="week-examples"></a>

下列範例示範如何使用 `$week`運算子來擷取指定日期的週數。

**建立範例文件**

```
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") }
]);
```

**查詢範例**

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

**輸出**

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

## 程式碼範例
<a name="week-code"></a>

若要檢視使用 `$week`命令的程式碼範例，請選擇您要使用的語言標籤：

------
#### [ 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()
```

------