1234567890 Unix time
date -d @1234567890
Sat Feb 14 00:31:30 CET 2009
Unix time, or POSIX time, is a system for describing points in time, defined as the number of seconds elapsed since midnight Coordinated Universal Time (UTC) of January 1, 1970, not counting leap seconds. It is widely used not only on Unix-like operating systems but also in many other computing systems. – Wikipedia.
Countdown qui.