title: Can I Rely on the iOS Device Clock Being Correct?
body: <p>I am working on an app that will sync data between users through a server that I control.  Currently, I am recording the UTC time of changes on each device, which then helps determine which data is most recent - the data on the server or on the device.</p>
  
  <p>Can I rely on the iPhone and iPad UTC time being accurate?  If not, how else could I stamp updates that will still let me detect updates from various users and detect possible update collisions?</p>