;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Apr 2000
;;;;
-;;;; $Id: datetime.lisp,v 1.1 2003/04/28 21:12:27 kevin Exp $
+;;;; $Id$
;;;;
;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
;;;;
(decode-universal-time
(encode-universal-time s m hour day month year))
(values (elt '("Monday" "Tuesday" "Wednesday" "Thursday"
- "Friday" "Saturday" "Sunday")
- wkday)
- (elt '("January" "February" "March" "April" "May" "June"
- "July" "August" "September" "October" "November"
- "December")
- (1- mn))
- (format nil "~A" dy) (format nil "~A" yr)
- (format nil "~2,'0D:~2,'0D:~2,'0D" hr min sec))))
+ "Friday" "Saturday" "Sunday")
+ wkday)
+ (elt '("January" "February" "March" "April" "May" "June"
+ "July" "August" "September" "October" "November"
+ "December")
+ (1- mn))
+ (format nil "~A" dy)
+ (format nil "~A" yr)
+ (format nil "~2,'0D:~2,'0D:~2,'0D" hr min sec))))
+(defun pretty-date-ut (&optional (tm (get-universal-time)))
+ (multiple-value-bind (sec min hr dy mn yr) (decode-universal-time tm)
+ (pretty-date yr mn dy hr min sec)))
(defun date-string (ut)
(if (typep ut 'integer)
(multiple-value-bind (sec min hr day mon year dow daylight-p zone)
- (decode-universal-time ut)
- (declare (ignore daylight-p zone))
- (format nil "~[Mon~;Tue~;Wed~;Thu~;Fri~;Sat~;Sun~], ~d ~[Jan~;Feb~;Mar~;Apr~;May~;Jun~;Jul~;Aug~;Sep~;Oct~;Nov~;Dec~] ~d ~2,'0d:~2,'0d:~2,'0d"
- dow
- day
- (1- mon)
- year
- hr min sec))))
+ (decode-universal-time ut)
+ (declare (ignore daylight-p zone))
+ (format nil "~[Mon~;Tue~;Wed~;Thu~;Fri~;Sat~;Sun~], ~d ~[Jan~;Feb~;Mar~;Apr~;May~;Jun~;Jul~;Aug~;Sep~;Oct~;Nov~;Dec~] ~d ~2,'0d:~2,'0d:~2,'0d"
+ dow
+ day
+ (1- mon)
+ year
+ hr min sec))))
+
+(defun print-seconds (secs)
+ (print-float-units secs "sec"))
+
+(defun print-float-units (val unit)
+ (cond
+ ((< val 1d-6)
+ (format t "~,2,9F nano~A" val unit))
+ ((< val 1d-3)
+ (format t "~,2,6F micro~A" val unit))
+ ((< val 1)
+ (format t "~,2,3F milli~A" val unit))
+ ((> val 1d9)
+ (format t "~,2,-9F giga~A" val unit))
+ ((> val 1d6)
+ (format t "~,2,-6F mega~A" val unit))
+ ((> val 1d3)
+ (format t "~,2,-3F kilo~A" val unit))
+ (t
+ (format t "~,2F ~A" val unit))))
+
+(defconstant +posix-epoch+
+ (encode-universal-time 0 0 0 1 1 1970 0))
+
+(defun posix-time-to-utime (time)
+ (+ time +posix-epoch+))
+
+(defun utime-to-posix-time (utime)
+ (- utime +posix-epoch+))
+
+;; Monthnames taken from net-telent-date to support lml2
+
+(defvar *monthnames*
+ '((1 . "January")
+ (2 . "February")
+ (3 . "March")
+ (4 . "April")
+ (5 . "May")
+ (6 . "June")
+ (7 . "July")
+ (8 . "August")
+ (9 . "September")
+ (10 . "October")
+ (11 . "November")
+ (12 . "December")))
+
+(defun monthname (stream arg colon-p at-p &optional width (mincol 0) (colinc 1) (minpad 0) (padchar #\Space))
+ "Print the name of the month (1=January) corresponding to ARG on STREAM. This is intended for embedding in a FORMAT directive: WIDTH governs the number of characters of text printed, MINCOL, COLINC, MINPAD, PADCHAR work as for ~A"
+ (declare (ignore colon-p))
+ (let ((monthstring (cdr (assoc arg *monthnames*))))
+ (if (not monthstring) (return-from monthname nil))
+ (let ((truncate (if width (min width (length monthstring)) nil)))
+ (format stream
+ (if at-p "~V,V,V,V@A" "~V,V,V,VA")
+ mincol colinc minpad padchar
+ (subseq monthstring 0 truncate)))))
+
+(defconstant* +zellers-adj+ #(0 3 2 5 0 3 5 1 4 6 2 4))
+
+(defun day-of-week (year month day)
+ "Day of week calculation using Zeller's Congruence.
+Input: The year y, month m (1 ≤ m ≤ 12) and day d (1 ≤ d ≤ 31).
+Output: n - the day of the week (Sunday = 0, Saturday = 6)."
+
+ (when (< month 3)
+ (decf year))
+ (mod
+ (+ year (floor year 4) (- (floor year 100)) (floor year 400)
+ (aref +zellers-adj+ (1- month)) day)
+ 7))
+
+;;;; Daylight Saving Time calculations
+
+;; Daylight Saving Time begins for most of the United States at 2
+;; a.m. on the first Sunday of April. Time reverts to standard time at
+;; 2 a.m. on the last Sunday of October. In the U.S., each time zone
+;; switches at a different time.
+
+;; In the European Union, Summer Time begins and ends at 1 am
+;; Universal Time (Greenwich Mean Time). It starts the last Sunday in
+;; March, and ends the last Sunday in October. In the EU, all time
+;; zones change at the same moment.
+
+;; Spring forward, Fall back
+;; During DST, clocks are turned forward an hour, effectively moving
+;; an hour of daylight from the morning to the evening.
+
+;; United States European Union
+
+;; Year DST Begins DST Ends Summertime Summertime
+;; at 2 a.m. at 2 a.m. period begins period ends
+;; at 1 a.m. UT at 1 a.m. UT
+;; ----------------------------------------------------------
+;; 2000 April 2 October 29 March 26 October 29
+;; 2001 April 1 October 28 March 25 October 28
+;; 2002 April 7 October 27 March 31 October 27
+;; 2003 April 6 October 26 March 30 October 26
+;; 2004 April 4 October 31 March 28 October 31
+;; 2005 April 3 October 30 March 27 October 30
+;; 2006 April 2 October 29 March 26 October 29
+;; 2007 April 1 October 28 March 25 October 28
+;; 2008 April 6 October 26 March 30 October 26
+
+
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