The Unix timestamp is a 32-bit signed integer format that holds the number of seconds since 01.01.1970, 00:00:00 UTC. It is an internationally accepted measure of time that is used as a fixed reference for time all around the globe. […] Below you see a binary representation of the UNIX timestamp.

We’re coming up on Day 20,000 of Unix epoch time, which will be midnight GMT on Friday October 4th. Every 5000 days represents about 13 years, so these don’t happen often. date -d @$(( 86400 * 20000 ))