Get-Unix-Time names a function, with lambda list (&OPTIONAL (UNIVERSAL-TIME (GET-UNIVERSAL-TIME))):
Get the UNIVERSAL-TIME (default to now) in Unix time.
Returns the number of seconds since the Unix epoch, 1970-01-01 at 00:00 Z time.
Note that Java time is Unix time multiplied by 1,000 (ie. time in msec) and is used is some places in the Infinity mode communications.
Defined in file src/types/date+time.lisp.