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(date-week-number): Correction, day of week starting

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week applied was off by one.
This commit is contained in:
Kevin Ryde 2003-08-26 00:14:28 +00:00
parent 8faa15593f
commit dab3d424b0
1 changed files with 6 additions and 1 deletions
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7
srfi/srfi-19.scm
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@ -1,6 +1,6 @@
;;; srfi-19.scm --- Time/Date Library
;; Copyright (C) 2001, 2002 Free Software Foundation, Inc.
;; Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
;;
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
@ -846,8 +846,13 @@
(modulo (- day-of-week-starting-week fdweek-day)
7)))
;; The "-1" here is a fix for the reference implementation, to make a new
;; week start on the given day-of-week-starting-week. date-year-day returns
;; a day starting from 1 for 1st Jan.
;;
(define (date-week-number date day-of-week-starting-week)
(quotient (- (date-year-day date)
1
(priv:days-before-first-week date day-of-week-starting-week))
7))