共用方式為

$week （日期表示式）

適用於： MongoDB 虛擬核心

運算符會將 $week 日期的周數傳回為介於 0 到 53 之間的值。 第 0 周從 1 月 1 日開始，後續幾周從星期日開始。 如果日期為 Null 或遺漏， $week 則傳回 null。

語法

$week 運算子的語法如下：

{
  $week: <dateExpression>
}

或使用時區規格：

{
  $week: {
    date: <dateExpression>,
    timezone: <timezoneExpression>
  }
}

參數

說明
dateExpression 解析為 Date、Timestamp 或 ObjectId 的任何運算式。
timezone 選擇性。 要用於計算的時區。 可以是 Olson 時區標識碼（例如“America/New_York”）或 UTC 位移（例如 “+0530” ）。

範例

讓我們了解數據集中範例 JSON 的使用 stores 方式。

{
  "_id": "905d1939-e03a-413e-a9c4-221f74055aac",
  "name": "Trey Research | Home Office Depot - Lake Freeda",
  "location": { "lat": -48.9752, "lon": -141.6816 },
  "staff": { "employeeCount": { "fullTime": 12, "partTime": 19 } },
  "sales": {
    "salesByCategory": [ { "categoryName": "Desk Lamps", "totalSales": 37978 } ],
    "revenue": 37978
  },
  "promotionEvents": [
    {
      "eventName": "Crazy Deal Days",
      "promotionalDates": {
        "startDate": { "Year": 2023, "Month": 9, "Day": 27 },
        "endDate": { "Year": 2023, "Month": 10, "Day": 4 }
      },
      "discounts": [
        { "categoryName": "Desks", "discountPercentage": 22 },
        { "categoryName": "Filing Cabinets", "discountPercentage": 23 }
      ]
    }
  ],
  "company": "Trey Research",
  "city": "Lake Freeda",
  "storeOpeningDate": ISODate("2024-12-30T22:55:25.779Z"),
  "lastUpdated": { "t": 1729983325, "i": 1 }
}

範例 1：取得商店開盤日期的周數

此範例會從商店開啟日期擷取周數。

db.stores.aggregate([
  { $match: { "_id": "905d1939-e03a-413e-a9c4-221f74055aac" } },
  {
    $project: {
      name: 1,
      storeOpeningDate: 1,
      openingWeek: { $week: { $toDate: "$storeOpeningDate" } }
    }
  }
])

查詢會傳回 ''storeOpeningDate' 字段中對應日期值的周數。

{
  "_id": "905d1939-e03a-413e-a9c4-221f74055aac",
  "name": "Trey Research | Home Office Depot - Lake Freeda",
  "storeOpeningDate": ISODate("2024-12-30T22:55:25.779Z"),
  "openingWeek": 52
}

範例 2：依開周分組商店

此範例會依開啟的一周將存放區分組以供分析。

db.stores.aggregate([
  {
    $project: {
      name: 1,
      openingWeek: { $week: { $toDate: "$storeOpeningDate" } },
      openingYear: { $year: { $toDate: "$storeOpeningDate" } }
    }
  },
  {
    $group: {
      _id: { week: "$openingWeek", year: "$openingYear" },
      storeCount: { $sum: 1 },
      stores: { $push: "$name" }
    }
  },
  { $sort: { "_id.year": 1, "_id.week": -1 } },
  { $limit : 3 } ])

查詢群組會依其開啟周和年份來儲存。

  {
    "_id": { "week": 40, "year": 2021 },
    "storeCount": 1,
    "stores": [ "First Up Consultants | Bed and Bath Center - South Amir" ]
  },
  {
    "_id": { "week": 52, "year": 2024 },
    "storeCount": 1,
    "stores": [ "Trey Research | Home Office Depot - Lake Freeda" ]
  },
  {
    "_id": { "week": 50, "year": 2024 },
    "storeCount": 2,
    "stores": [
      "Fourth Coffee | Paper Product Bazaar - Jordanechester",
      "Adatum Corporation | Pet Supply Center - West Cassie"
    ]
  }

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