POSIX time.h defines "unix time" as seconds since the epoch in type... time_t, which (according to the POSIX standard) can be either an integer or a floating po

POSIX time.h defines "unix time" as seconds since the epoch in type... time_t, which (according to the POSIX standard) can be either an integer or a floating point value. In practice though, "unix time" is merely a convention which is based off of the POSIX standard.