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

The `$week` operator in Amazon DocumentDB returns the week number of a date (0-53) based on the ISO 8601 standard. The week number is calculated based on the year and the day of the week, with Monday as the first day of the week.

**Parameters**

None

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

The following example demonstrates how to use the `$week` operator to retrieve the week number of a given date.

**Create sample documents**

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

**Query example**

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

**Output**

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

## Code examples
<a name="week-code"></a>

To view a code example for using the `$week` command, choose the tab for the language that you want to use:

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

------