Date and timestamp types in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new Date object representing the current date and time.

MongoDB

const currentDate = new [1]();

Drag options to blanks, or click blank then click option'

AISODate

BTimestamp

CDate

DTime

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Timestamp' instead of 'Date' to create a date object.

Using 'ISODate' which is a helper but not the standard Date constructor.

The Date object in MongoDB JavaScript represents date and time. Using new Date() creates the current date and time.

2fill in blank

medium

Complete the code to insert a document with a field 'createdAt' set to the current date and time.

MongoDB

db.collection.insertOne({ createdAt: [1] });

Drag options to blanks, or click blank then click option'

ATimestamp()

Bnew Date()

CISODate()

DDate()

Attempts:

3 left

💡 Hint

Common Mistakes

Using Date() without 'new' which returns a string, not a Date object.

Using Timestamp() which is a different type.

To store the current date and time in a document, use new Date(). This creates a Date object representing now.

3fill in blank

hard

Fix the error in the query to find documents with a 'createdAt' date greater than January 1, 2023.

MongoDB

db.collection.find({ createdAt: { $gt: [1] } })

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Anew Date('2023-01-01')

BTimestamp('2023-01-01')

CISODate('2023-01-01')

D'2023-01-01'

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of a Date object causes no matches or errors.

Using 'Timestamp' incorrectly as it requires different parameters.

The $gt operator compares dates. You must provide a Date object. new Date('2023-01-01') creates a valid Date object for comparison.

4fill in blank

hard

Fill both blanks to create a query that finds documents with a 'lastModified' timestamp less than or equal to the current time.

MongoDB

db.collection.find({ lastModified: { [1]: [2] } })

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A$lte

Bnew Date()

C$lt

DTimestamp()

Attempts:

3 left

💡 Hint

Common Mistakes

Using $lt instead of $lte changes the condition.

Using Timestamp() without 'new' or parameters is incorrect.

The operator $lte means 'less than or equal to'. Using new Date() gives the current date and time for comparison.

5fill in blank

hard

Fill all three blanks to create an update that sets the 'updatedAt' field to the current date and increments a 'version' field by 1.

MongoDB

db.collection.updateOne({ _id: id }, { [1]: { updatedAt: [2] }, [3]: { version: 1 } })

Drag options to blanks, or click blank then click option'

A$set

Bnew Date()

C$inc

D$currentDate

Attempts:

3 left

💡 Hint

Common Mistakes

Using $currentDate instead of $set with new Date().

Forgetting to increment the version field properly.

$set updates fields to specific values, here setting updatedAt to the current date with new Date(). $inc increments the version field by 1.