Server timestamps in Firebase - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a Firestore field to the server timestamp.

Firebase

docRef.set({ createdAt: [1] })

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

ATimestamp.now()

BDate.now()

Cnew Date()

Dfirebase.firestore.FieldValue.serverTimestamp()

Attempts:

3 left

💡 Hint

Common Mistakes

Using client time like Date.now() instead of server timestamp.

Using new Date() which is client-side time.

Use firebase.firestore.FieldValue.serverTimestamp() to set the field to the server's current time.

2fill in blank

medium

Complete the code to update a Firestore document's 'updatedAt' field with the server timestamp.

Firebase

docRef.update({ updatedAt: [1] })

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

ATimestamp.now()

Bfirebase.firestore.FieldValue.serverTimestamp()

Cnew Date()

DDate.now()

Attempts:

3 left

💡 Hint

Common Mistakes

Using client-side date functions instead of server timestamp.

Confusing update with set method.

Use firebase.firestore.FieldValue.serverTimestamp() to update with the server time.

3fill in blank

hard

Fix the error in the code to correctly set a Firestore field to the server timestamp.

Firebase

docRef.set({ time: [1] })

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

Afirebase.firestore.FieldValue.serverTimestamp()

Bfirebase.firestore.Timestamp.now()

Cnew Date()

DDate.now()

Attempts:

3 left

💡 Hint

Common Mistakes

Using Timestamp.now() which is client time.

Using new Date() or Date.now() which are client times.

The correct method is firebase.firestore.FieldValue.serverTimestamp() to get the server timestamp placeholder.

4fill in blank

hard

Fill both blanks to create a Firestore document with 'createdAt' and 'updatedAt' fields set to server timestamps.

Firebase

docRef.set({ createdAt: [1], updatedAt: [2] })

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

Afirebase.firestore.FieldValue.serverTimestamp()

Bnew Date()

CDate.now()

Dfirebase.firestore.Timestamp.now()

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing client-side and server-side timestamp methods.

Using different methods for createdAt and updatedAt.

Both fields should use firebase.firestore.FieldValue.serverTimestamp() to get server timestamps.

5fill in blank

hard

Fill all three blanks to update a Firestore document with 'lastLogin', 'lastLogout', and 'lastAction' fields set to server timestamps.

Firebase

docRef.update({ lastLogin: [1], lastLogout: [2], lastAction: [3] })

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

Anew Date()

Bfirebase.firestore.FieldValue.serverTimestamp()

DDate.now()

Attempts:

3 left

💡 Hint

Common Mistakes

Using client-side date functions.

Using inconsistent timestamp methods across fields.

All fields should use firebase.firestore.FieldValue.serverTimestamp() to ensure server time is recorded.