> If you want some fun watch what various NTP servers around the world do when Leap Seconds roll around. You will see clocks that start to drift for 15 minutes

> If you want some fun watch what various NTP servers around the world do when Leap Seconds roll around. You will see clocks that start to drift for 15 minutes before jumping to the right time, some that wait until 8AM local time on the following day to correct, and some that just go crazy. And of course you have Google's clock smearing across most of a day. As a note, clock smearing is a non-standard hack invented by Google, because most programs are too broken to handle the leap second warning event and inserting/deleting a second properly, per designed. And you shall never add a clock smearing server to the www.pool.ntp.org.