Check if system time is altered or not offline using my code. Remember, if you restart your iphone, you will need internet once to callibrate system time.
SMTime.getTime { success, date, message in
// ... your code
}
success: true: It means the system time is not changed.success: false: It means the system time is changed.message: Use message to display default message, or you can use your own messages as well.