Answers for "firebase timestamp to datetime"

firebase timestamp

import firebase from 'firebase';

{
	timestamp: firebase.firestore.FieldValue.serverTimestamp(),
}

firebase query timestamp

Query query = mFirestore.collection("rootcollection")
    .orderBy("timestamp", Query.Direction.DESCENDING)
    .whereEqualTo("month", 3);

convert firebase timestamp to date

SimpleDateFormat sfd = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
sfd.format(new Date(timestamp));

If you are looking to get a Date instance from Timestamp
If you need to get just the Date object from Timestamp, the Timestamp instance comes with a toDate() method that returns a Date instance.

For clarity:

Date javaDate = firebaseTimestampObject.toDate()