How Can I Get the Current Date and Time When Inserting Data into Firebase Realtime Database?

Capturing Current Date/Time on Firebase Realtime Database Insertions

In Firebase Realtime Database, it's often desirable to record the timestamp of data insertion for tracking purposes. This can be achieved by utilizing ServerValue.TIMESTAMP, which stores the current server time as a timestamp in the database.

Implementation

To set the current date/time when adding a new value to the database through the control panel, utilize the following code:

DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
Map map = new HashMap();
map.put("timestamp", ServerValue.TIMESTAMP);
ref.child("yourNode").updateChildren(map);

Retrieval

When retrieving the timestamp, Firebase will store it as a Long. To format the retrieved time as a String, use the following method:

public static String getTimeDate(long timestamp) {
    DateFormat dateFormat = getDateTimeInstance();
    Date netDate = (new Date(timestamp));
    return dateFormat.format(netDate);
}

Model Class

For mapping the model class to correctly handle the timestamp, ensure it has a field like this:

private Map<String, String> timestamp;

Cloud Functions Approach

Alternatively, consider writing a function in Cloud Functions for Firebase to obtain the server timestamp without user interaction:

exports.currentTime = functions.https.onRequest((req, res) => {
    res.send({"timestamp":new Date().getTime()})
})

By using ServerValue.TIMESTAMP or the Cloud Functions approach, you can reliably capture the current date/time when inserting values into Firebase Realtime Database, providing valuable information for tracking and analytics purposes.

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