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. It is neither a linear representation of time nor a true representation of UTC (though it is frequently mistaken for both) as the times it represents are UTC but it has no way of representing UTC leap seconds (e.g. 1998-12-31 23:59:60).
On February 13, 2009 at exactly 23:31:30 (UTC), Unix time was equal to '1234567890'. Parties and other celebrations were held around the world, among various technical subcultures, to celebrate 1234567890 day. You can catch it via 1234567890 day
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