JavaScript按日期查询MongoDB中的数据的要点示例

{
“_id” : ObjectId(“557ac1e2153c43c320393d9d”),
“msgType” : “text”,
“sendTime” : ISODate(“2015-06⑴2T11:26:26.000Z”)
}

{
“_id” : ObjectId(“557ac1ee153c43c320393d9e”),
“msgType” : “text”,
“sendTime” : ISODate(“2015-06⑴2T11:26:38.000Z”)
}

{
“_id” : ObjectId(“557ac2012de5d32d213963b5”),
“msgType” : “text”,
“sendTime” : ISODate(“2015-06⑴2T11:26:56.000Z”)
}

{
“_id” : ObjectId(“557ac978bb31196e21d23868”),
“msgType” : “text”,
“sendTime” : ISODate(“2015-06⑴2T11:58:47.000Z”)
}

{
“_id” : ObjectId(“557ac9afbb31196e21d23869”),
“msgType” : “text”,
“sendTime” : ISODate(“2015-06⑴2T11:59:43.000Z”)
}

db.getCollection(‘wechat_message’).aggregate(
[
{ $project : { day : {$substr: [“$sendTime”, 0, 10] }}},
{ $group : { _id : “$day”, number : { $sum : 1 }}},
{ $sort : { _id : ⑴ }}
]
)

"result" : [  
    { 
      "_id" : "2015-07-06", 
      "number" : 13.0000000000000000 
    },  
    { 
      "_id" : "2015-07-05", 
      "number" : 3.0000000000000000 
    },  
    { 
      "_id" : "2015-07-03", 
      "number" : 10.0000000000000000 
    },  
    { 
      "_id" : "2015-07-02", 
      "number" : 29.0000000000000000 
    }, 
]

coll.aggregate([ 
     {$project:{sendDate: {$substr: ['$sendTime', 0, 10]}, sendTime: 1, content:1}}, 
     {$match:{sendDate: '2015-07-05'}}, 
    ]) 

coll.aggregate([ 
     {$match: {'sendTime': {'$gte': new Date('2015-07-05'), '$lt': new Date('2015-07-06')}}} 

coll.aggregate([ 
     {$match: {'sendTime': {'$gte': new Date('2015-07-05 00:00:00'), '$lte': new Date('2015-07-05 23:59:59')}}} 

[ { _id: 5599b09bc16aac90e9fb7995, sendDate: ‘2015-07-05’ },
{ _id: 5599b161c16aac90e9fb7996, sendDate: ‘2015-07-05’ },
{ _id: 5599b161c16aac90e9fb7997, sendDate: ‘2015-07-05’ } ]