TIME ( a -- u f )
'a' is an address to a timespec structure (it is 2cells width).
TIME fills 'a' with the unixtime, seconds in the 1th cell and nanoseconds
in the 2th cell.
'f' is the syscall fail flag, 'u' is an eventual error code from the syscall.
HUMANTIME ( u -- year month day day-of-year weekday hour min sec )
Converts unixtime to humantime, while some of us think in unixtime, not all people do!.
UNIXTIME ( year month day day-of-year weekday hour min sec -- u )
Converts humantime back to unixtime.