如何在MongoDB中将日期转换为时间戳
要将日期转换为MongoDB中的时间戳，请使用aggregate()。让我们创建一个包含文档的集合-
> db.demo93.insertOne({"UserName":"Chris","ArrivalDate":new ISODate("2020-10-01")});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2d4b6479799acab037af68")
}
> db.demo93.insertOne({"UserName":"David","ArrivalDate":new ISODate("2019-12-31")});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2d4b7379799acab037af69")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo93.find();
这将产生以下输出-
{ "_id" : ObjectId("5e2d4b6479799acab037af68"), "UserName" : "Chris", "ArrivalDate" : ISODate("2020-10-01T00:00:00Z") }
{ "_id" : ObjectId("5e2d4b7379799acab037af69"), "UserName" : "David", "ArrivalDate" : ISODate("2019-12-31T00:00:00Z") }以下是在MongoDB中将日期转换为时间戳的查询-
> db.demo93.aggregate([
... { "$match": { "UserName": "Chris" }},
... { "$addFields": {
... "timestamp": { "$toLong": "$ArrivalDate" }
... }}
... ]);这将产生以下输出-
{ "_id" : ObjectId("5e2d4b6479799acab037af68"), "UserName" : "Chris", "ArrivalDate" : ISODate("2020-10-01T00:00:00Z"), "timestamp" : NumberLong("1601510400000") }