decode-universal-time universal-time &optional time-zone
⇒ second, minute, hour, date, month, year, day, daylight-p, zone
| 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
(recently (get-universal-time))
(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)
Implementation-dependent mechanisms for calculating when or if daylight savings time is in effect for any given session.