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ANSI Common Lisp   25 Environment   25.2 Dictionary of Environment
25.2.2 encode-universal-time function
encode-universal-time second minute hour date month year &optional time-zone
Arguments and Values:
second, minute, hour, date, month, year, time-zone - the corresponding parts of a decoded time. (Note that some of the nine values in a full decoded time are redundant, and so are not used as inputs to this function.)

universal-time - a universal time.

encode-universal-time converts a time from Decoded Time format to a universal time.

If time-zone is supplied, no adjustment for daylight savings time is performed.

 (encode-universal-time 0 0 0 1 1 1900 0)  0
 (encode-universal-time 0 0 1 4 7 1976 5)  2414296800
;; The next example assumes Eastern Daylight Time.
 (encode-universal-time 0 0 1 4 7 1976)  2414293200
See Also:
decode-universal-time, get-decoded-time

In the last example, the assumption is the machine running Common Lisp is using (United States) Eastern Daylight Time, not that Common Lisp assumes that.
Allegro CL Implementation Details:

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