Epoch time and Epoch time milestone
In the fields of chronology and periodization, an epoch means an instant in time chosen as the origin of a particular era. The “epoch” then serves as a reference point from which time is measured. Time measurement units are counted from the epoch so that the date and time of events can be specified unambiguously.
On Friday, February 13th 2009, 23:31:30 UTC, it will be exactly 1,234,567,890 seconds since the beginning of Epoch Time, which was on midnight of January 1, 1970. So it’s the time for Unix nerds to celebrate 1234567890 🙂
And here’s a site that’s counting down to that momentous event: http://coolepochcountdown.com/