JAVASCRIPT

convert firebase timestamp to date js

// to get as date 
const date = new TimeStamp(yourTimeStamp.seconds , yourTimeStamp.nanoseconds).toDate();
// to get as string 
const date = new TimeStamp(yourTimeStamp.seconds , yourTimeStamp.nanoseconds).toDate().toDateString();

javascript date to firebase timestamp

const created = firebase.firestore.Timestamp.fromDate(new Date()).toDate();

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()