title: What is the use of CLOCK_REALTIME?
body: <p>I am reading about the difference between <code>CLOCK_REALTIME</code> and <code>CLOCK_MONOTONIC</code></p>
  
  <p><a href="https://stackoverflow.com/questions/3523442/difference-between-clock-realtime-and-clock-monotonic">Difference between CLOCK_REALTIME and CLOCK_MONOTONIC?</a></p>
  
  <p>The <code>CLOCK_REALTIME</code> has discontinuities in time, can jump forwards as well as backwards: is that a bug in this clock? How could a clock that gives inconsistent time be reliable?</p>