title: How do I get a server timestamp from Firebase's iOS API?
body: <p>I have an iOS app that uses Firebase and currently has a few dictionaries with keys that are NSDate objects.  The obvious issue with this is that NSDate draws from the device's system time, which is not universal.</p>
  
  <p>With that, what's the best way to get a server timestamp (similar to Firebase.ServerValue.TIMESTAMP for the Web API) using Firebase's iOS API so that I can sort my dictionary keys chronologically?</p>
  
  <p>I'm also aware of the chronological nature of IDs generated by childByAutoID, but I can't figure out the proper way to sort these in code.  While they may be returned in chronological order, any time something like allKeys is called on them, the order goes out the window.</p>
  
  <p>Any help with this issue would be greatly appreciated!   </p>