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$week
Amazon DocumentDB 中的$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）
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
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()
