What is the accuracy of scheduleAtFixedRate?
<p>we need to keep an eye on the pc clock from a Java program. For this, we schedule a Runnable using scheduleAtFixedRate() every 500 ms. We call System.currentTimeMillis() from this every time. If we see that the there is a bigger difference then 500 ms +- a certain allowed delta, then we assume the clock has changed (then we need to do some other stuff).</p>

<p>Would this be a correct way of doing things? Tests on Linux show that a 50 ms delta is enough during normal operation. On windows, we have to increase it too 100 ms, otherwise, it is thinking the time has changed on every check we do.</p>

<p>Any other ideas on how to do this?</p>
