bug#43677: 27.1; Calc holidays off-by-one error, incorrect business day calculation

[Aaron Zeng <zeng.aaron.l@gmail.com>]

Hello,

I observe the following incorrect behavior starting from `emacs -Q`:

1. M-x calc
2. ' <2020-11-01> RET --- displays "<Sun Nov 1, 2020>"
3. 1 t - --- should have subtracted one business day, but it displays
"<Sat Oct 31, 2020>" instead of "<Fri Oct 30, 2020>"

Adding a business day to Saturday gives Tuesday instead of Monday.  It
seems like this is would be an off-by-one error.  This appears to be
confirmed by setting the Holidays vector in calc (`s e Holidays`) to
be `[fri, sat]` and trying the above procedure again.

After applying the workaround, instead of seeing Saturday and Tuesday
as the previous and next business days, respectively, I see Friday and
Monday as I would expect.


In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.21,
cairo version 1.16.0)
Windowing system distributor 'Colin Harrison', version 11.0.60900031
System Description: NixOS 20.03 (Markhor)

Recent messages:
When done with a buffer, type , c
Type , c to finish, , k to cancel, and M-p and M-n to recover older messages
Auto-saving...done
Saving file /home/aaron/todo/.git/COMMIT_EDITMSG...
Wrote /home/aaron/todo/.git/COMMIT_EDITMSG
Git finished
Running git push -v origin refs/heads/master:refs/heads/master
Git finished
line-move-visual: End of buffer [10 times]
Quit [3 times]
Quit
Configured using:
 'configure
 --prefix=/nix/store/afbpyhbafbc0rhl54h86wcsvnpprygfb-emacs-27.1
 --disable-build-details --with-modules --with-x-toolkit=gtk3
 --with-xft --with-cairo CFLAGS=-DMAC_OS_X_VERSION_MAX_ALLOWED=101200'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY
INOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD
JSON PDUMPER GMP

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Org

Minor modes in effect:
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  ido-vertical-mode: t
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Features:
(shadow cl-print debug calc-map calc-stat hippie-exp emacsbug sendmail
pulse calc-store calc-undo calc-vec calc-prog ox-texinfo ox-org ox-md
ox-latex ox-icalendar ox-html table ox-ascii ox-publish ox calc-forms
evil-iedit-state mail-extr skeleton shell-pop company-web-html
company-web company-css web-completion-data emmet-mode
smartparens-html web-mode dune link-hint nix-mode nix-repl nix-shell
nix-store nix-instantiate nix-shebang nix-format nix sort
magit-bookmark bookmark org-projectile org-category-capture
org-capture calc-arith calccomp calc-misc font-utils magit-extras
make-mode dired-x eieio-opt evil-matchit-ocaml evil-matchit-simple
evil-matchit evil-matchit-sdk counsel-projectile term/rxvt term/xterm
xterm cua-base calc-aent calc-yank calc-alg calc-menu tabify cal-move
ledger-mode ledger-check ledger-texi ledger-test ledger-sort
ledger-report ledger-reconcile ledger-occur ledger-fonts
ledger-fontify ledger-state ledger-complete ledger-schedule
ledger-init ledger-xact ledger-post ledger-exec ledger-navigate
ledger-context ledger-commodities ledger-regex misearch multi-isearch
calc-embed calc-ext calc calc-loaddefs calc-macs mule-util diary-lib
diary-loaddefs cal-iso scheme org-eldoc bcc32-org evil-org ob-C
smartparens-c cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles
cc-align cc-engine cc-vars cc-defs ob-js ob-perl ob-python
smartparens-python python tramp-sh ob-sql ob-shell org-download
org-attach org-id org-superstar toc-org org-indent image-file
org-element avl-tree ol-man org-checklist ol-eshell eshell-z em-dirs
esh-var em-term term ehelp em-smart esh-mode eshell esh-cmd esh-ext
esh-opt esh-proc esh-io esh-arg esh-module esh-groups esh-util
org-tempo tempo ol-info org-habit ol-docview doc-view image-mode exif
ol-bibtex bibtex org-agenda org-refile smartparens-org org-clock orgit
org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro org-footnote
org-src ob-comint org-pcomplete org-list org-faces org-entities
org-version ob-emacs-lisp ob-core ob-eval org-table org-keys
org-loaddefs cal-menu calendar cal-loaddefs ol org-compat org-macs
evil-surround company-shell flycheck-bashate sh-script executable ffap
tramp tramp-loaddefs trampver tramp-integration files-x tramp-compat
parse-time iso8601 ls-lisp jka-compr info+ pp company-capf overseer
pkg-info url-http url url-proxy url-privacy url-expand url-methods
url-history mailcap url-auth url-cookie url-domsuf url-util url-gw nsm
epl auto-compile packed elisp-slime-nav flycheck-elsa flycheck-package
package-lint finder eval-sexp-fu helpful trace edebug backtrace
info-look dash-functional elisp-refs smex magit-gitflow face-remap
evil-magit git-rebase magit-submodule magit-obsolete magit-popup
magit-blame magit-stash magit-reflog magit-bisect magit-push
magit-pull magit-fetch magit-clone magit-remote magit-commit
magit-sequence magit-notes magit-worktree magit-tag magit-merge
magit-branch magit-reset magit-files magit-refs magit-status magit
magit-repos magit-apply magit-wip magit-log which-func magit-diff
smerge-mode magit-core magit-autorevert magit-margin magit-transient
magit-process magit-mode git-commit transient magit-git magit-section
magit-utils log-edit message rmc puny rfc822 mml mml-sec epa gnus-util
rmail rmail-loaddefs text-property-search time-date mailabbrev
mail-utils gmm-utils mailheader pcvs-util add-log with-editor
async-bytecomp ocamlformat whitespace vc-git diff-mode company-files
company-keywords company-etags etags fileloop generator company-gtags
company-dabbrev-code company-dabbrev company-semantic company-template
merlin-company company merlin-eldoc merlin-imenu flycheck-ocaml
merlin-cap merlin crm ocp-indent utop utop-minor-mode goto-addr
bug-reference auto-highlight-symbol evil-lisp-state flycheck-pos-tip
pos-tip flycheck-ledger flycheck find-func highlight-numbers
parent-mode highlight-parentheses hideshow rainbow-delimiters
smartparens-config smartparens-ml smartparens-text smartparens
yasnippet-snippets yasnippet tuareg speedbar sb-image ezimage dframe
tuareg-opam flymake-proc flymake smie caml-help caml-types caml-emacs
find-file editorconfig-core editorconfig-core-handle
editorconfig-fnmatch zoom-frm frame-cmds frame-fns avoid
vi-tilde-fringe diminish evil-escape display-line-numbers disp-table
projectile grep recentf tree-widget mode-line-bell indent-guide
column-enforce-mode fancy-battery battery dired-async async dired-aux
winner server xterm-color spacemacs-whitespace-cleanup ws-butler winum
spacemacs-purpose-popwin window-purpose-x imenu-list imenu ibuf-ext
ibuffer ibuffer-loaddefs unicode-fonts symbol-overlay
string-inflection spaceline-config spaceline-segments spaceline
powerline powerline-separators powerline-themes saveplace savehist
popwin persp-mode org-rich-yank merlin-iedit iedit iedit-lib
multiple-cursors-core ligature ivy-rich ivy-hydra ivy-avy avy hl-todo
fasd window-purpose window-purpose-fixes
window-purpose-prefix-overload window-purpose-switch let-alist
window-purpose-layout window-purpose-core window-purpose-configuration
window-purpose-utils eyebrowse evil-unimpaired f evil-textobj-line
evil-anzu anzu emr popup s editorconfig noutline outline counsel xdg
xref project dired dired-loaddefs compile swiper ivy flx delsel
ivy-faces ivy-overlay colir color clean-aindent-mode clang-format xml
cl hybrid-mode evil-evilified-state which-key use-package
use-package-ensure use-package-delight use-package-diminish
use-package-bind-key bind-key use-package-core hydra lv cus-edit evil
evil-keybindings evil-integration undo-tree diff evil-maps
evil-commands reveal flyspell ispell evil-jumps evil-command-window
evil-types evil-search evil-ex shell pcomplete comint ansi-color
evil-macros evil-repeat evil-states evil-core evil-common windmove
thingatpt rect evil-digraphs evil-vars ring bind-map quelpa mm-decode
mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr lisp-mnt help-fns radix-tree hl-line xt-mouse
autorevert filenotify cl-extra wid-edit base16-material-theme
base16-theme format-spec info finder-inf mb-depth midnight time
cus-start cus-load ido-vertical-mode ido core-spacemacs core-spacebind
core-use-package-ext core-transient-state core-micro-state core-toggle
core-keybindings core-fonts-support core-themes-support
core-display-init core-jump core-release-management
core-custom-settings core-configuration-layer eieio-compat
core-progress-bar core-spacemacs-buffer core-funcs ht dash help-mode
warnings package browse-url url-handlers url-parse auth-source cl-seq
password-cache json map url-vars eieio eieio-core eieio-loaddefs epg
epg-config core-command-line pcase core-debug edmacro kmacro derived
cl-macs profiler easymenu cl-loaddefs cl-lib core-hooks
page-break-lines easy-mmode core-env load-env-vars rx
core-dotspacemacs advice core-emacs-backports core-dumper subr-x seq
byte-opt gv bytecomp byte-compile cconv tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame minibuffer cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese
eucjp-ms cp51932 hebrew greek romanian slovak czech european ethiopic
indian cyrillic chinese composite charscript charprop case-table
epa-hook jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 2463178 2188195)
 (symbols 48 263811 35)
 (strings 32 617131 174299)
 (string-bytes 1 26918019)
 (vectors 16 132846)
 (vector-slots 8 2935185 1278064)
 (floats 8 1621 9719)
 (intervals 56 146727 145044)
 (buffers 1000 550))