X-Git-Url: http://git.kpe.io/?p=kmrcl.git;a=blobdiff_plain;f=datetime.lisp;h=30c815c9d01d5bf482e084c5c6ee6ed8b9c0dd7d;hp=9d204494d7835a77163a69e3ed24aef1ef7321c9;hb=1142016daa209cb657b035c651641a94ef49892a;hpb=aa610805927518a648eb0da6a8713cd0a83337df diff --git a/datetime.lisp b/datetime.lisp index 9d20449..30c815c 100644 --- a/datetime.lisp +++ b/datetime.lisp @@ -7,7 +7,7 @@ ;;;; 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 ;;;; @@ -26,24 +26,132 @@ (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) +(defun date-string (&optional (ut (get-universal-time))) (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 + +