This time there won't be any debug or similar. I simply just found out that in 2015 there will be a leap second, so if you run some really time-sensible service you may need to pay attention and check if this added second won't disrupt it.
Last time that a leap second occurred - in 2012 - Meetup, StumbleUpon, Yelp, Reddit, FourSquare and even LinkedIn had lots of problems. So, you'd better be prepared!
If you want to know something more about the leap second - its history, function and something more, don't forget to read this post: Linux NTP Leap Second . For a possible solution, instead, read this other post: How To Setup Ubuntu NTP Client
Anyway , the next leap second will be on June 30, 2015. So on that date the last second of the day will be 23:59:60 .