Fetch month, day, year, etc. from ISODate in MongoDB?

The mongo shell provides various methods like ISODate() to return the date, either as a string or as a Date object. ISODate() constructor returns a Date object using the ISODate() wrapper.

Let us create a collection with documents −

> db.demo548.insertOne({"dueDate":new ISODate("2020-04-09 12:12:40")});{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e8e30499e5f92834d7f05de")
}

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

> db.demo548.find();

This will produce the following output −

{ "_id" : ObjectId("5e8e30499e5f92834d7f05de"), "dueDate" : ISODate("2020-04-
09T12:12:40Z") }

Following is the query to display, month, day, week, year, etc. from ISODate −

> db.demo548.aggregate( [ { $project: { Year: { $year: "$dueDate"
}, Month: { $month: "$dueDate" }, Day: { $dayOfMonth: "$dueDate"
}, Hour: { $hour: "$dueDate" }, Minutes: { $minute: "$dueDate" },
Seconds: { $second: "$dueDate" }, Milliseconds: { $millisecond: "$dueDate" },
DayOfYear: { $dayOfYear: "$dueDate" }, DayOfWeek: { $dayOfWeek: "$dueDate"
}, Week: { $week: "$dueDate" } } } ] ).pretty();

This will produce the following output −

{
   "_id" : ObjectId("5e8e30499e5f92834d7f05de"),
   "Year" : 2020,
   "Month" : 4,
   "Day" : 9,
   "Hour" : 12,
   "Minutes" : 12,
   "Seconds" : 40,
   "Milliseconds" : 0,
   "DayOfYear" : 100,
   "DayOfWeek" : 5,
   "Week" : 14
}