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 a DateTime and a NumericDate

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.

Unix Time Overflow #

At 03:14:08 UTC on January 19, 2038 (+231), a 32-bit signed integer representation of Unix time will overflow. Systems using a 32-bit signed integer Unix time_t will therefore be unable to represent that time, or any later, and will likely wrap around to 20:45:52 UTC on December 13, 1901, with integer value -231. This is a NumericDate

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« This page (revision-10) was last changed on 08-Mar-2017 11:15 by jim