Incrementing a date in JavaScript, in order to update MongoDB?

To increment a date, use setDate, getDate() and perform increment operation. Let us first create a collection with documents −

> db.demo168.insertOne({"DueDate":null});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e3695ae9e4f06af551997d6")
}

Display all documents from a collection with the help of find() method −

> db.demo168.find();

This will produce the following output −

{ "_id" : ObjectId("5e3695ae9e4f06af551997d6"), "DueDate" : null }

Following is the query to increment a date in JavaScript, in order to update MongoDB −

> var t = new Date();
> t.setDate(t.getDate()+1);
1580722089017
>
> var dat = new Date();
> dat .setDate(dat .getDate()+2);
1580808489085
>
> db.demo168.update(
...    { "_id": ObjectId("5e3695ae9e4f06af551997d6") },
...    {
...       "$currentDate": { "DueDate": true },
...       "$set": {
...          "DueDate1": t,
...          "DueDate2": dat
...       }
...    }
... )
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })

Display all documents from a collection with the help of find() method −

> db.demo168.find();

This will produce the following output −

{ "_id" : ObjectId("5e3695ae9e4f06af551997d6"), "DueDate" : ISODate("2020-02-02T09:28:09.308Z"), "DueDate1" : ISODate("2020-02-03T09:28:09.017Z"), "DueDate2" : ISODate("2020-02-04T09:28:09.085Z") }