https://frederickvanbrabant.com/2017/07/04/yk38-bug.html

As you might know, I co-organise a PHP meetup called: PHP Antwerp. Some time ago we had one of our talented speakers: Joeri Sebrechts talk about “What every developer should know about time, no excuses“ (If you ever have the chance to see it, I wholly recommend it). In this talk, he mentions briefly the Y2k38 problem. A bug that will wreck havoc on systems that store time in Unix epoch timestamps.