$dayOfYear - Amazon DocumentDB
Example (MongoDB Shell)Code examples

$dayOfYear

The $dayOfYear operator in Amazon DocumentDB returns the day of the year for a date as a number between 1 and 366 (365 in non-leap years).

Parameters

  • expression: The date field or expression from which to extract the day of the year.

Example (MongoDB Shell)

This example demonstrates how to use the $dayOfYear operator to extract the day of the year from a date field in an Amazon DocumentDB collection.

Create sample documents

db.weather.insert([
  {
    "temperature" : 97.5,
    "humidity": 0.60,
    "date" : new Date("2023-03-15")
  },
  {
    "temperature" : 82.3,
    "humidity": 0.75,
    "date" : new Date("2023-12-31")
  }
])

Query example

db.weather.aggregate([
  {
    $project: {
      dayOfYear: { $dayOfYear: "$date" }
    }
  }
]).pretty()

Output

{ "_id" : ObjectId("642b86fc7d8e07af279bbe63"), "dayOfYear" : 74 }
{ "_id" : ObjectId("642b86fc7d8e07af279bbe64"), "dayOfYear" : 365 }

Code examples

To view a code example for using the $dayOfYear 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 collection = db.collection('weather');

  const result = await collection.aggregate([
    {
      $project: {
        dayOfYear: { $dayOfYear: "$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']
    collection = db['weather']

    result = list(collection.aggregate([
        {
            '$project': {
                'dayOfYear': { '$dayOfYear': '$date' }
            }
        }
    ]))

    print(result)

    client.close()

example()