Unix time
system for identifying instants in time; the number of seconds that have elapsed since the UTC midnight before 1 January 1970, ignoring leap seconds / From Wikipedia, the free encyclopedia
Unix time is the number of seconds that have passed since the initial date and time known by UNIX as Tuesday 1 January 1970 00:00:00 UTC.[2] It is mostly used in Unix-like and many other operating systems. People can check Unix time on most Unix computers by typing date +%s
on the Unix command line.