I guess the real question should be, "What do you use for time?". Bought a new wristwatch. As I was getting ready to set the time on it, I noticed that the time shown on my phone and the time on my laptop differed by four minutes. The phone is four minutes ahead of the laptop. Both systems are supposed to update automatically....so why are they different? According to Google and the Atomic clock, the laptop is correct; and the smart phone isn't all that smart.