Syntax error How to calculate timestamp difference in hours with MongoDB?

How to calculate timestamp difference in hours with MongoDB?

To calculate timestamp difference, use aggregate framework. Let us first create a collection with documents −

> db.timestampDifferenceDemo.insertOne({
   "MovieBeginningTime": new ISODate("2019-05-12 10:20:30"),
   "MovieEndingTime":new ISODate("2019-05-12 12:30:20")
});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd7ba1f6d78f205348bc644")
}
> db.timestampDifferenceDemo.insertOne({
   "MovieBeginningTime": new ISODate("2019-05-12 04:00:00"),
   "MovieEndingTime":new ISODate("2019-05-12 07:10:00")
});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd7ba3b6d78f205348bc645")
}

Following is the query to display all documents from a collection with the help of find() method −

> db.timestampDifferenceDemo.find().pretty();

This will produce the following output −

{
   "_id" : ObjectId("5cd7ba1f6d78f205348bc644"),
   "MovieBeginningTime" : ISODate("2019-05-12T10:20:30Z"),
   "MovieEndingTime" : ISODate("2019-05-12T12:30:20Z")
}
{
   "_id" : ObjectId("5cd7ba3b6d78f205348bc645"),
   "MovieBeginningTime" : ISODate("2019-05-12T04:00:00Z"),
   "MovieEndingTime" : ISODate("2019-05-12T07:10:00Z")
}

Following is the query to calculate timestamp difference in MongoDB (in hours) −

> db.timestampDifferenceDemo.aggregate([
   {$project: {
      DifferenceInHours: {$divide: [{$subtract: ["$MovieEndingTime", "$MovieBeginningTime"]}, 3600000]}
   }}
]);

This will produce the following output −

{ "_id" : ObjectId("5cd7ba1f6d78f205348bc644"), "DifferenceInHours" : 2.1638888888888888 }
{ "_id" : ObjectId("5cd7ba3b6d78f205348bc645"), "DifferenceInHours" : 3.1666666666666665 }
Updated on: 2019-07-30T22:30:26+05:30

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