title: Get Created date and last login date from FIRUser with Firebase 3
body: <p>I just want to get the created date and the last sign in date of a user with firebase, my plan is to let user login with Facebook and then signup and add new information and save the user in the real time database with the created date and last login date, so how to keep the date un sync with the Firebase system after saving them, or should I just use those f FIRUser and do not save them in the real time database</p>
  
  <p><a href="https://i.stack.imgur.com/GV4rO.png" rel="noreferrer"><img src="https://i.stack.imgur.com/GV4rO.png" alt="enter image description here"></a> </p>
  
  <p><strong>Question 1:</strong> how to get the created and last login date from FIRUser like displayed in the dashboard (see attached image)</p>
  
  <p><strong>Question 2:</strong> Once I get those dates I will save them in realtime database, so how to keep the last sign in date in sync ? </p>