For this, use the $hour operator. Let us first create a collection with documents with one of the field as date −
> db.mongoDbSearchForHoursDemo.insertOne({"CustomerName":"Larry","OrderDatetime":new ISODate("2019-01-31 09:45:50")}); { "acknowledged" : true, "insertedId" : ObjectId("5cd6e8a86d78f205348bc62a") } > db.mongoDbSearchForHoursDemo.insertOne({"CustomerName":"Larry","OrderDatetime":new ISODate("2019-02-21 01:10:01")}); { "acknowledged" : true, "insertedId" : ObjectId("5cd6e8b86d78f205348bc62b") } > db.mongoDbSearchForHoursDemo.insertOne({"CustomerName":"Larry","OrderDatetime":new ISODate("2019-04-01 04:10:11")}); { "acknowledged" : true, "insertedId" : ObjectId("5cd6e8e26d78f205348bc62c") } > db.mongoDbSearchForHoursDemo.insertOne({"CustomerName":"Larry","OrderDatetime":new ISODate("2019-05-11 08:53:01")}); { "acknowledged" : true, "insertedId" : ObjectId("5cd6e8f26d78f205348bc62d") }
Following is the query to display all documents from a collection with the help of find() method −
> db.mongoDbSearchForHoursDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd6e8a86d78f205348bc62a"), "CustomerName" : "Larry", "OrderDatetime" : ISODate("2019-01-31T09:45:50Z") } { "_id" : ObjectId("5cd6e8b86d78f205348bc62b"), "CustomerName" : "Larry", "OrderDatetime" : ISODate("2019-02-21T01:10:01Z") } { "_id" : ObjectId("5cd6e8e26d78f205348bc62c"), "CustomerName" : "Larry", "OrderDatetime" : ISODate("2019-04-01T04:10:11Z") } { "_id" : ObjectId("5cd6e8f26d78f205348bc62d"), "CustomerName" : "Larry", "OrderDatetime" : ISODate("2019-05-11T08:53:01Z") }
Following is the query to search for specific hours. Here, we will get records for specific hours 8 and 1. The output would display the ID for both the times (hours) −
>db.mongoDbSearchForHoursDemo.aggregate([{$project:{SpecificHours:{$hour:"$OrderDatetime"}}}, {$match:{SpecificHours:{"$in":[08,01]}}}]);
This will produce the following output −
{ "_id" : ObjectId("5cd6e8b86d78f205348bc62b"), "SpecificHours" : 1 } { "_id" : ObjectId("5cd6e8f26d78f205348bc62d"), "SpecificHours" : 8 }