ANSI Common Lisp 25 Environment 25.2 Dictionary of Environment
universal-time &optional time-zone
second, minute, hour, date, month, year, day, daylight-p, zone
- Arguments and Values:
universal-time - a universal time.
time-zone - a time zone.
second, minute, hour, date, month,
year, day, daylight-p, zone - a decoded time.
Returns the decoded time represented by the given universal time.
If time-zone is not supplied,
it defaults to the current time zone adjusted for daylight saving time.
If time-zone is supplied, daylight saving time information is ignored.
The daylight saving time flag is nil if time-zone is supplied.
(decode-universal-time 0 0) 0, 0, 0, 1, 1, 1900, 0, false, 0
;; The next two examples assume Eastern Daylight Time.
(decode-universal-time 2414296800 5) 0, 0, 1, 4, 7, 1976, 6, false, 5
(decode-universal-time 2414293200) 0, 0, 1, 4, 7, 1976, 6, true, 5
;; This example assumes that the time zone is Eastern Daylight Time
;; (and that the time zone is constant throughout the example).
(let* ((here (nth 8 (multiple-value-list (get-decoded-time)))) ;Time zone
(a (nthcdr 7 (multiple-value-list (decode-universal-time recently))))
(b (nthcdr 7 (multiple-value-list (decode-universal-time recently here)))))
(list a b (equal a b))) ((T 5) (NIL 5) NIL)
- Affected By:
Implementation-dependent mechanisms for calculating when or if daylight
savings time is in effect for any given session.
- See Also:
Section 25.1.4 Time
- Allegro CL Implementation Details: