Overview#Unix Time (also known as POSIX time) is a system for describing instants in time, defined as the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970 not counting leap seconds. (ie the Unix Epoch),
Unix Time is used widely in Unix-like and many other Operating Systems and file formats. Because it does not handle leap seconds, it is neither a linear representation of time nor a true representation of UTC.
Unix Time may be checked on most Unix systems by typing date +%s on the command-line.