db.command.aggregate.dateFromParts
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1. 操作符描述功能:给定日期的相关信息,构建并返回一个日期对象。
声明:db.command.aggregate.dateFromParts(object)
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2. 操作符参数字段 | 类型 | 必填 | 说明 |
---|---|---|---|
year | number | 否 | 年 |
month | number | 否 | 月 |
day | number | 否 | 日 |
hour | number | 否 | 小时 |
minute | number | 否 | 分钟 |
second | number | 否 | 秒 |
millisecond | number | 否 | 毫秒 |
timezone | string | 否 | 时区 |
isoWeekYear | number | 否 | isoWeekYear |
isoWeek | number | 否 | isoWeek |
isoDayOfWeek | number | 否 | isoDayOfWeek |
语法如下:
db.command.aggregate.dateFromParts({ year: <year>, month: <month>, day: <day>, hour: <hour>, minute: <minute>, second: <second>, millisecond: <ms>, timezone: <tzExpression>})
您也可以使用 ISO 8601 的标准:
db.command.aggregate.dateFromParts({ isoWeekYear: <year>, isoWeek: <week>, isoDayOfWeek: <day>, hour: <hour>, minute: <minute>, second: <second>, millisecond: <ms>, timezone: <tzExpression>})
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3. 示例代码// 云函数环境下示例代码const tcb = require('@cloudbase/node-sdk')const app = tcb.init({ env: 'xxx'})
const db = app.database()const $ = db.command.aggregate
exports.main = async (event, context) => { const res = await db .collection('dates') .aggregate() .project({ _id: 0, date: $.dateFromParts({ year: 2017, month: 2, day: 8, hour: 12, timezone: 'America/New_York' }) }) .end() console.log(res.data)}
输出如下:
{ "date": ISODate("2017-02-08T17:00:00.000Z")}