What is the unix timestamp?
The unix timestamp is a way to track time as a running total of seconds. This count starts at the Unix Epoch on January 1st, 1970 at UTC. Therefore, the unix timestamp is merely the number of seconds between a particular date and the Unix Epoch. It should also be pointed out (thanks to the comments from visitors to this site) that this point in time technically does not change no matter where you are located on the globe. This is very useful to computer systems for tracking and sorting dated information in dynamic and distributed applications both online and client side.
What happens on January 19, 2038?
On this date the Unix TimeStamp will cease to work due to a 32-bit overflow. Before this moment millions of applications will need to either adopt a new convention for timestamps or be migrated to 64-bit systems which will buy the timestamp a "bit" more time.