There will be a Leap Second on December 31st at 23:59:59 pm UTC. Are you ready?
This 2015 Bloomberg article is a good overview of how some different organizations handle the leap second. Make sure that your instance of Network Time Protocol (NTP) is up to date.
Network Time Foundation needs funding to get the General Timestamp API (GTSAPI) up and running to address the issues of reliable and trustable timestamps, even in the face of leap seconds involving different leap smears.
Here’s a new publication from Homeland Security regarding Best Practices for Leap Second in December, 2016.