time-of-day clocks also have various oddities, as described in the next section. In particular, if the local clock is too far ahead of the NTP server, it may be forcibly reset and appear to jump back to a previous point in time. These jumps, as well as similar jumps caused by leap seconds, make time-of-day clocks unsuitable for measuring elapsed time
I tried explaining this concept to a 9 year old. It seems that she could grasp the idea that there is a lot more to the social media applications she uses than the simplistic interface she lives in, but it was hard to comprehend the idea of time as being relative.
