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The $isoWeek
operator returns the week number of the year in ISO 8601 format, ranging from 1 to 53. The operator accepts a date expression that resolves to a Date, Timestamp, or ObjectId. In ISO 8601, weeks start on Monday and the first week of the year is the week that contains the first Thursday of the year.
{
$isoWeek: <dateExpression>
}
Parameter | Description |
---|---|
dateExpression |
An expression that resolves to a Date, Timestamp, or ObjectId. If the expression resolves to null or is missing, $isoWeek returns null. |
Consider this sample document from the stores collection.
{
"_id": "0fcc0bf0-ed18-4ab8-b558-9848e18058f4",
"name": "First Up Consultants | Beverage Shop - Satterfieldmouth",
"location": {
"lat": -89.2384,
"lon": -46.4012
},
"staff": {
"totalStaff": {
"fullTime": 8,
"partTime": 20
}
},
"sales": {
"totalSales": 75670,
"salesByCategory": [
{
"categoryName": "Wine Accessories",
"totalSales": 34440
},
{
"categoryName": "Bitters",
"totalSales": 39496
},
{
"categoryName": "Rum",
"totalSales": 1734
}
]
},
"promotionEvents": [
{
"eventName": "Unbeatable Bargain Bash",
"promotionalDates": {
"startDate": {
"Year": 2024,
"Month": 6,
"Day": 23
},
"endDate": {
"Year": 2024,
"Month": 7,
"Day": 2
}
},
"discounts": [
{
"categoryName": "Whiskey",
"discountPercentage": 7
},
{
"categoryName": "Bitters",
"discountPercentage": 15
},
{
"categoryName": "Brandy",
"discountPercentage": 8
},
{
"categoryName": "Sports Drinks",
"discountPercentage": 22
},
{
"categoryName": "Vodka",
"discountPercentage": 19
}
]
},
{
"eventName": "Steal of a Deal Days",
"promotionalDates": {
"startDate": {
"Year": 2024,
"Month": 9,
"Day": 21
},
"endDate": {
"Year": 2024,
"Month": 9,
"Day": 29
}
},
"discounts": [
{
"categoryName": "Organic Wine",
"discountPercentage": 19
},
{
"categoryName": "White Wine",
"discountPercentage": 20
},
{
"categoryName": "Sparkling Wine",
"discountPercentage": 19
},
{
"categoryName": "Whiskey",
"discountPercentage": 17
},
{
"categoryName": "Vodka",
"discountPercentage": 23
}
]
}
]
}
This query extracts the ISO week number for promotion event start dates.
db.stores.aggregate([
{ $match: {"_id": "40d6f4d7-50cd-4929-9a07-0a7a133c2e74"} },
{ $unwind: "$promotionEvents" },
{
$project: {
eventName: "$promotionEvents.eventName",
startDate: {
$dateFromParts: {
year: "$promotionEvents.promotionalDates.startDate.Year",
month: "$promotionEvents.promotionalDates.startDate.Month",
day: "$promotionEvents.promotionalDates.startDate.Day"
}
}
}
},
{
$project: {
eventName: 1,
startDate: 1,
isoWeekNumber: { $isoWeek: "$startDate" },
year: { $year: "$startDate" }
}
}
])
This query returns the following results:
[
{
"_id": "40d6f4d7-50cd-4929-9a07-0a7a133c2e74",
"eventName": "Massive Markdown Mania",
"startDate": "2023-06-29T00:00:00.000Z",
"isoWeekNumber": 26,
"year": 2023
},
{
"_id": "40d6f4d7-50cd-4929-9a07-0a7a133c2e74",
"eventName": "Fantastic Deal Days",
"startDate": "2023-09-27T00:00:00.000Z",
"isoWeekNumber": 39,
"year": 2023
},
{
"_id": "40d6f4d7-50cd-4929-9a07-0a7a133c2e74",
"eventName": "Discount Delight Days",
"startDate": "2023-12-26T00:00:00.000Z",
"isoWeekNumber": 52,
"year": 2023
},
{
"_id": "40d6f4d7-50cd-4929-9a07-0a7a133c2e74",
"eventName": "Super Sale Spectacular",
"startDate": "2024-03-25T00:00:00.000Z",
"isoWeekNumber": 13,
"year": 2024
},
{
"_id": "40d6f4d7-50cd-4929-9a07-0a7a133c2e74",
"eventName": "Grand Deal Days",
"startDate": "2024-06-23T00:00:00.000Z",
"isoWeekNumber": 25,
"year": 2024
},
{
"_id": "40d6f4d7-50cd-4929-9a07-0a7a133c2e74",
"eventName": "Major Bargain Bash",
"startDate": "2024-09-21T00:00:00.000Z",
"isoWeekNumber": 38,
"year": 2024
}
]
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