From 4f75d945436d8c6ddc2deb5936a22bffe94b7ccc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Sat, 4 Jul 2020 06:34:52 +0200
Subject: Merge (datetime util) into (datetime).

---
 config.scm                                |   4 +-
 module/datetime.scm                       | 387 +++++++++++++++++++++++++++++
 module/datetime/timespec.scm              |   1 -
 module/datetime/util.scm                  | 389 ------------------------------
 module/datetime/zic.scm                   |   1 -
 module/entry-points/html.scm              |   1 -
 module/entry-points/ical.scm              |   1 -
 module/entry-points/server.scm            |   1 -
 module/entry-points/terminal.scm          |   1 -
 module/main.scm                           |   2 +-
 module/output/html.scm                    |   1 -
 module/output/ical.scm                    |   1 -
 module/output/sxml-types.scm              |   1 -
 module/output/terminal.scm                |   1 -
 module/output/types.scm                   |   3 +-
 module/output/xcal.scm                    |   1 -
 module/vcomponent.scm                     |   1 -
 module/vcomponent/datetime.scm            |   1 -
 module/vcomponent/group.scm               |   1 -
 module/vcomponent/recurrence/display.scm  |   7 +-
 module/vcomponent/recurrence/generate.scm |   1 -
 module/vcomponent/recurrence/internal.scm |   1 -
 module/vcomponent/recurrence/parse.scm    |   1 -
 module/vulgar/termios.scm                 |   2 +-
 tests/datetime-util.scm                   |   4 +-
 tests/recurrence-rule.scm                 |   2 +-
 tests/recurrence.scm                      |   3 +-
 tests/recurring.scm                       |   2 +-
 tests/rrule-parse.scm                     |   2 +-
 29 files changed, 405 insertions(+), 419 deletions(-)
 delete mode 100644 module/datetime/util.scm

diff --git a/config.scm b/config.scm
index 460f678e..e74f9541 100644
--- a/config.scm
+++ b/config.scm
@@ -11,6 +11,8 @@
              (glob)
 
              (util config)
+
+             (datetime)
              )
 
 (set-config! 'calendar-files (glob "~/.local/var/cal/*"))
@@ -68,4 +70,4 @@
                         'pre "<br/>" 'post))]
          [else (parse-links str)])))
 
-(set-config! 'week-start (@ (datetime util) mon))
+(set-config! 'week-start mon)
diff --git a/module/datetime.scm b/module/datetime.scm
index 2c0972ea..eff3fdba 100644
--- a/module/datetime.scm
+++ b/module/datetime.scm
@@ -10,6 +10,13 @@
   :use-module (srfi srfi-9 gnu)
 
   :use-module (util)
+
+  :use-module (srfi srfi-41)
+  :use-module (srfi srfi-41 util)
+  :use-module (ice-9 i18n)
+  :use-module (ice-9 format)
+  :use-module (util config)
+  :re-export (locale-month)
   )
 
 (define-many define-public
@@ -726,3 +733,383 @@
 (read-hash-extend #\0 date-reader)
 (read-hash-extend #\1 date-reader)
 (read-hash-extend #\2 date-reader)
+
+
+
+
+(define-public (start-of-month date)
+  (set (day date) 1))
+
+(define-public (end-of-month date)
+  (set (day date) (days-in-month date)))
+
+(define-public (start-of-year date)
+  (set-> date
+         (day 1)
+         (month 1)))
+
+(define-public (parse-freeform-date str)
+  (let* (((year month day) (map string->number (string-split str #\-))))
+    (date year: year month: month day: day)
+    ))
+
+(define-public (date-stream date-increment start-day)
+  (stream-iterate (lambda (d) (date+ d date-increment))
+                  start-day))
+
+(define-public (day-stream start-day)
+  (date-stream (date day: 1) start-day))
+
+(define-public (month-stream start-day)
+  (date-stream (date month: 1) start-day))
+
+(define-public (week-stream start-day)
+  (date-stream (date day: 7) start-day))
+
+(define-public (time-min a b)
+  (if (time<? a b) a b))
+
+(define-public (time-max a b)
+  (if (time<? a b) b a))
+
+(define-public (date-min a b)
+  (if (date< a b) a b))
+
+(define-public (date-max a b)
+  (if (date< a b) b a))
+
+(define-public (datetime-min a b)
+  (if (datetime< a b) a b))
+
+(define-public (datetime-max a b)
+  (if (datetime< a b) b a))
+
+(define*-public (month+ date-object #:optional (change 1))
+  (date+ date-object (date month: change)))
+
+(define*-public (month- date-object #:optional (change 1))
+  (date- date-object (date month: change)))
+
+;; https://projecteuclid.org/euclid.acta/1485888738
+;; 1. Begel.
+;; J sei die Zahl des Jahrhunderts,
+;; K die Jahrszahl innerhalb desselben,
+;; m die Zahl des Monats,
+;; q die Zahl des Monatstags,
+;; h die Zahl des Wochentags;
+(define (zeller J K m q)
+  (modulo (+ q
+             (floor-quotient (* 13 (1+ m))
+                             5)
+             K
+             (floor-quotient K 4)
+             5
+             (- J))
+          7))
+
+;; 0 indexed, starting at sunday.
+(define-public (week-day date)
+  (let* ((J K (floor/ (year date) 100))
+         (m (month date)))
+    (if (memv m '(1 2))
+        (zeller J (1- K) (+ m 12) (day date))
+        (zeller J K (month date) (day date)))))
+
+
+(define-many define-public
+  (sun) 0
+  (mon) 1
+  (tue) 2
+  (wed) 3
+  (thu) 4
+  (fri) 5
+  (sat) 6
+  )
+
+
+(define-public week-start (make-parameter sun))
+
+(define-config week-start sun
+  "First day of week"
+  pre: (ensure (lambda (x) (<= sun x sat)))
+  post: week-start)
+
+;; given a date, returns the date the first week of that year starts on.
+;; @example
+;; (week-1-start #2020-01-01 mon)
+;; ⇒ 2019-12-30
+;; @end example
+(define*-public (week-1-start d optional: (wkst (week-start)))
+  (let* ((ystart (start-of-year d))
+         (day-index (modulo (- (week-day ystart) wkst) 7)))
+    (if (> day-index 3)
+        (date+ ystart (date day: (- 7 day-index)))
+        (date- ystart (date day: day-index)))))
+
+;; (week-number #2020-01-01 mon) ; => 1
+;; (week-number #2019-12-31 mon) ; => 1
+(define*-public (week-number d optional: (wkst (week-start)))
+  ;; Calculating week number for starts of week was much simpler.
+  ;; We can both skip the special cases for Jan 1, 2 & 3. It also
+  ;; solved some weird bug that was here before.
+
+  (let ((d (start-of-week d wkst)))
+   (cond
+    [(and (= 12 (month d))
+          (memv (day d) '(29 30 31))
+          (< (year d) (year (date+ (start-of-week d wkst)
+                                   (date day: 3)))))
+     1]
+
+    [else
+     (let* ((w1-start (week-1-start d wkst))
+            (week day (floor/ (days-in-interval w1-start d)
+                              7)))
+       (1+ week))])))
+
+(define*-public (date-starting-week week-number d optional: (wkst (week-start)))
+  (date+ (week-1-start d wkst)
+         (date day: (* (1- week-number) 7))))
+
+
+(define*-public (week-day-name week-day-number optional: truncate-to
+                               key: (locale %global-locale))
+
+  ;; NOTE this allows days larger than 7 (sunday if counting from monday).
+  (let ((str (catch 'out-of-range
+               (lambda () (locale-day (1+ (modulo week-day-number 7)) locale))
+               (lambda (oor str num) (scm-error 'out-of-range 'week-day-name
+                                           "~a == (~a % 7) + 1"
+                                           (list num week-day-number) (list week-day-number))))))
+    ;; I also know about the @var{locale-day-short} method, but I need
+    ;; strings of length 2.
+    (if truncate-to
+        (string-take str truncate-to)
+        str)))
+
+(define*-public (datetime->string datetime optional: (fmt "~Y-~m-~dT~H:~M:~S") key: allow-unknown?)
+  (define date (get-date datetime))
+  (define time ((@ (datetime) get-time%) datetime))
+  (with-output-to-string
+    (lambda ()
+      (fold (lambda (token state)
+              (case state
+                ((#\~)
+                 (case token
+                   ((#\~) (display "~"))
+                   ((#\H) (format #t "~2'0d" (hour time)))
+                   ((#\k) (format #t "~2' d" (hour time)))
+                   ((#\M) (format #t "~2'0d" (minute time)))
+                   ((#\S) (format #t "~2'0d" (second time)))
+                   ((#\Y) (format #t "~4'0d" (year date)))
+                   ((#\m) (format #t "~2'0d" (month date)))
+                   ((#\d) (format #t "~2'0d" (day date)))
+                   ;; Should be same as ~_d
+                   ((#\s) (display (datetime->unix-time datetime))) ; epoch time!
+                   ((#\e) (format #t "~2' d" (day date)))
+                   ((#\1) (format #t "~4'0d-~2'0d-~2'0d"
+                                  (year date) (month date) (day date)))
+                   ((#\3) (format #t "~2'0d:~2'0d:~2'0d"
+                                  (hour time) (minute time) (second time)))
+                   ((#\A) (display (week-day-name (week-day date))))
+                   ((#\a) (display (week-day-name (week-day date) 3)))
+                   ((#\b) (display (locale-month-short (month date))))
+                   ((#\B) (display (locale-month (month date))))
+                   ((#\Z) (when (equal? "UTC" (get-timezone datetime)) (display "Z")))
+                   (else (unless allow-unknown?
+                           (error 'datetime->string "Invalid format token ~a" token))))
+                 #f)
+                (else (unless (char=? #\~ token) (display token)) token)))
+            #f
+            (string->list fmt)))))
+
+(define*-public (date->string date optional: (fmt "~Y-~m-~d") key: allow-unknown?)
+  (datetime->string (datetime date: date) fmt allow-unknown?: allow-unknown?))
+
+(define*-public (time->string time optional: (fmt "~H:~M:~S") key: allow-unknown?)
+  (datetime->string (datetime time: time) fmt allow-unknown?: allow-unknown?))
+
+
+;; @verbatim
+;;    A          B          C          D          E         ¬F
+;; |s1|     :     |s2| : |s1|     :     |s2| :          : |s1|
+;; |  |     :     |  | : |  ||s2| : |s1||  | : |s1||s2| : |  |
+;; |  ||s2| : |s1||  | : |  ||  | : |  ||  | : |  ||  | :
+;;     |  | : |  |     : |  ||  | : |  ||  | : |  ||  | :     |s2|
+;;     |  | : |  |     : |  |     :     |  | :          :     |  |
+;;
+;; Infinitely short ---+|s2| : |s1|+--- : two instants don't overlap
+;; events, overlap   s1      :      s2  :
+;; @end verbatim
+;; 
+;; E is covered by both case A and B.
+(define-public (timespan-overlaps? s1-begin s1-end s2-begin s2-end)
+  "Return whetever or not two timespans overlap."
+  (or
+   ;; A
+   (and (date/-time<? s2-begin s1-end)
+        (date/-time<? s1-begin s2-end))
+
+   ;; B
+   (and (date/-time<? s1-begin s2-end)
+        (date/-time<? s2-begin s1-end))
+
+   ;; C
+   (and (date/-time<=? s1-begin s2-begin)
+        (date/-time<? s2-end s1-end))
+
+   ;; D
+   (and (date/-time<=? s2-begin s1-begin)
+        (date/-time<? s1-end s2-end))))
+
+(define-public (add-day d)
+  (date+ d (date day: 1)))
+
+(define-public (remove-day d)
+  (date- d (date day: 1)))
+
+(define-public (in-date-range? start-date end-date)
+  (lambda (date)
+    (date<= start-date date end-date)))
+
+;; Returns a list of the seven week days, with @var{week-start}
+;; as the beginning of the week.
+;; @example
+;; (weekday-list sun)
+;; => (0 1 2 3 4 5 6)
+;; @end example
+(define-public (weekday-list week-start)
+  (take (drop (apply circular-list (iota 7))
+              week-start)
+        7))
+
+;; returns the date the week containing d started.
+;; (start-of-week #2020-04-02 sun) ; => 2020-03-29
+(define*-public (start-of-week d optional: (week-start (week-start)))
+  (date- d (date day: (modulo (- (week-day d)
+                                 week-start)
+                              7))))
+
+;; (end-of-week #2020-04-01 mon)
+;; => 2020-04-05
+(define*-public (end-of-week d optional: (week-start (week-start)))
+  (date+ (start-of-week d week-start)
+         (date day: 6)))
+
+
+;; Given a month and and which day the week starts on,
+;; returns three lists, which are:
+;; The days leading up to the current month, but share a week
+;; The days in the current month
+;; The days after the current month, but which shares a week.
+;; 
+;;       mars 2020
+;; må ti on to fr lö sö
+;;                    1
+;;  2  3  4  5  6  7  8
+;;  9 10 11 12 13 14 15
+;; 16 17 18 19 20 21 22
+;; 23 24 25 26 27 28 29
+;; 30 31
+;; @lisp
+;; (month-days #2020-03-01 mon)
+;; ; ⇒ (2020-02-24 ... 2020-02-29)
+;; ; ⇒ (2020-03-01 ... 2020-03-31)
+;; ; ⇒ (2020-04-01 ... 2020-04-05)
+;; @end lisp
+;; Ignores day component of @var{date}.
+(define*-public (month-days date optional: (week-start (week-start)))
+  (let* ((month-len (days-in-month date))
+         (prev-month-len (days-in-month (month- date)))
+         (month-start (modulo (- (week-day date) week-start) 7)))
+    (values
+     (map (lambda (d) (set (day (month- date)) d))
+          (iota month-start (1+ (- prev-month-len month-start))))
+     (map (lambda (d) (set (day date) d)) (iota month-len 1))
+     (map (lambda (d) (set (day (month+ date)) d))
+          (iota (modulo (- (* 7 5) month-len month-start) 7) 1)))))
+
+
+
+
+(define-public (days-in-interval start-date end-date)
+  (let ((diff (date-difference (date+ end-date (date day: 1)) start-date)))
+    (with-streams
+     (fold + (day diff)
+           (map days-in-month
+                (take (+ (month diff)
+                         (* 12 (year diff)))
+                      (month-stream start-date)))))))
+
+;; Day from start of the year, so 1 feb would be day 32.
+;; Also known as Julian day.
+(define-public (year-day date)
+  (days-in-interval (start-of-year date) date))
+
+
+;; @example
+;; (time->decimal-hour #10:30:00) ; => 10.5
+;; @end example
+(define-public (time->decimal-hour time)
+  (exact->inexact (+ (hour time)
+                     (/ (minute time) 60)
+                     (/ (second time) 3600))))
+
+(define*-public (datetime->decimal-hour dt optional: start-date)
+
+  (let ((date-diff
+         (cond [start-date
+                (let* ((end-date (date+ start-date (get-date dt))))
+                  (days-in-interval start-date end-date)) ]
+               [(or (not (zero? (month (get-date dt))))
+                    (not (zero? (year (get-date dt)))))
+                (error "Multi-month intervals only supported when start-date is given" dt)]
+               [else (day (get-date dt))])))
+    (+ (time->decimal-hour ((@ (datetime) get-time%) dt))
+       (* (1- date-diff) 24))))
+
+;; Returns a list of all dates from start to end.
+;; both inclusive
+;; date, date → [list date]
+(define-public (date-range start end)
+  (stream->list
+   (stream-take-while (lambda (d) (date<= d end))
+                      (day-stream start))))
+
+
+
+;; Returns the first instance of the given week-day after @var{d}.
+;; @example
+;; (find-first-week-day mon #2020-04-01)
+;; => #2020-04-06
+;; (find-first-week-day mon #2020-04-10)
+;; => #2020-04-13
+;; (find-first-week-day mon #2020-04-30)
+;; => #2020-05-04
+;; @end example
+(define-public (find-first-week-day wday d)
+  (let* ((start-day (week-day d))
+         (diff (- wday start-day)))
+    (date+ d (date day: (modulo diff 7)))))
+
+;; returns instances of the given week-day in month between
+;; month-date and end of month.
+;; @example
+;; (all-wday-in-month mon #2020-06-01)
+;; => (#2020-06-01 #2020-06-08 #2020-06-15 #2020-06-22 #2020-06-29)
+;; (all-wday-in-month mon #2020-06-10)
+;; => (#2020-06-15 #2020-06-22 #2020-06-29)
+;; @end example
+;; week-day, date → (list date)
+(define-public (all-wday-in-month wday month-date)
+  (stream->list
+   (stream-take-while
+    (lambda (d) (= (month d) (month month-date)))
+    (week-stream (find-first-week-day wday month-date)))))
+
+
+(define-public (all-wday-in-year wday year-date)
+  (stream->list
+   (stream-take-while
+    (lambda (d) (= (year d) (year year-date)))
+    (week-stream (find-first-week-day wday year-date)))))
diff --git a/module/datetime/timespec.scm b/module/datetime/timespec.scm
index ae8b3d9b..ddd8a164 100644
--- a/module/datetime/timespec.scm
+++ b/module/datetime/timespec.scm
@@ -7,7 +7,6 @@
   :use-module (util)
   :use-module (util exceptions)
   :use-module (datetime)
-  :use-module (datetime util)
   :use-module (srfi srfi-1)
   :use-module (srfi srfi-9 gnu)
   )
diff --git a/module/datetime/util.scm b/module/datetime/util.scm
deleted file mode 100644
index f525f680..00000000
--- a/module/datetime/util.scm
+++ /dev/null
@@ -1,389 +0,0 @@
-(define-module (datetime util)
-  :use-module (datetime)
-  :use-module (srfi srfi-1)
-  :use-module (srfi srfi-26)
-  :use-module (srfi srfi-41)
-  :use-module (srfi srfi-41 util)
-  :use-module (ice-9 i18n)
-  :use-module (ice-9 format)
-  :use-module (util)
-  :use-module (util config)
-  :re-export (locale-month)
-  )
-
-(define-public (start-of-month date)
-  (set (day date) 1))
-
-(define-public (end-of-month date)
-  (set (day date) (days-in-month date)))
-
-(define-public (start-of-year date)
-  (set-> date
-         (day 1)
-         (month 1)))
-
-(define-public (parse-freeform-date str)
-  (let* (((year month day) (map string->number (string-split str #\-))))
-    (date year: year month: month day: day)
-    ))
-
-(define-public (date-stream date-increment start-day)
-  (stream-iterate (cut date+ <> date-increment)
-                  start-day))
-
-(define-public (day-stream start-day)
-  (date-stream (date day: 1) start-day))
-
-(define-public (month-stream start-day)
-  (date-stream (date month: 1) start-day))
-
-(define-public (week-stream start-day)
-  (date-stream (date day: 7) start-day))
-
-(define-public (time-min a b)
-  (if (time<? a b) a b))
-
-(define-public (time-max a b)
-  (if (time<? a b) b a))
-
-(define-public (date-min a b)
-  (if (date< a b) a b))
-
-(define-public (date-max a b)
-  (if (date< a b) b a))
-
-(define-public (datetime-min a b)
-  (if (datetime< a b) a b))
-
-(define-public (datetime-max a b)
-  (if (datetime< a b) b a))
-
-(define*-public (month+ date-object #:optional (change 1))
-  (date+ date-object (date month: change)))
-
-(define*-public (month- date-object #:optional (change 1))
-  (date- date-object (date month: change)))
-
-;; https://projecteuclid.org/euclid.acta/1485888738
-;; 1. Begel.
-;; J sei die Zahl des Jahrhunderts,
-;; K die Jahrszahl innerhalb desselben,
-;; m die Zahl des Monats,
-;; q die Zahl des Monatstags,
-;; h die Zahl des Wochentags;
-(define (zeller J K m q)
-  (modulo (+ q
-             (floor-quotient (* 13 (1+ m))
-                             5)
-             K
-             (floor-quotient K 4)
-             5
-             (- J))
-          7))
-
-;; 0 indexed, starting at sunday.
-(define-public (week-day date)
-  (let* ((J K (floor/ (year date) 100))
-         (m (month date)))
-    (if (memv m '(1 2))
-        (zeller J (1- K) (+ m 12) (day date))
-        (zeller J K (month date) (day date)))))
-
-
-(define-many define-public
-  (sun) 0
-  (mon) 1
-  (tue) 2
-  (wed) 3
-  (thu) 4
-  (fri) 5
-  (sat) 6
-  )
-
-
-(define-public week-start (make-parameter sun))
-
-(define-config week-start sun
-  "First day of week"
-  pre: (ensure (lambda (x) (<= sun x sat)))
-  post: week-start)
-
-;; given a date, returns the date the first week of that year starts on.
-;; @example
-;; (week-1-start #2020-01-01 mon)
-;; ⇒ 2019-12-30
-;; @end example
-(define*-public (week-1-start d optional: (wkst (week-start)))
-  (let* ((ystart (start-of-year d))
-         (day-index (modulo (- (week-day ystart) wkst) 7)))
-    (if (> day-index 3)
-        (date+ ystart (date day: (- 7 day-index)))
-        (date- ystart (date day: day-index)))))
-
-;; (week-number #2020-01-01 mon) ; => 1
-;; (week-number #2019-12-31 mon) ; => 1
-(define*-public (week-number d optional: (wkst (week-start)))
-  ;; Calculating week number for starts of week was much simpler.
-  ;; We can both skip the special cases for Jan 1, 2 & 3. It also
-  ;; solved some weird bug that was here before.
-
-  (let ((d (start-of-week d wkst)))
-   (cond
-    [(and (= 12 (month d))
-          (memv (day d) '(29 30 31))
-          (< (year d) (year (date+ (start-of-week d wkst)
-                                   (date day: 3)))))
-     1]
-
-    [else
-     (let* ((w1-start (week-1-start d wkst))
-            (week day (floor/ (days-in-interval w1-start d)
-                              7)))
-       (1+ week))])))
-
-(define*-public (date-starting-week week-number d optional: (wkst (week-start)))
-  (date+ (week-1-start d wkst)
-         (date day: (* (1- week-number) 7))))
-
-
-(define*-public (week-day-name week-day-number optional: truncate-to
-                               key: (locale %global-locale))
-
-  ;; NOTE this allows days larger than 7 (sunday if counting from monday).
-  (let ((str (catch 'out-of-range
-               (lambda () (locale-day (1+ (modulo week-day-number 7)) locale))
-               (lambda (oor str num) (scm-error 'out-of-range 'week-day-name
-                                           "~a == (~a % 7) + 1"
-                                           (list num week-day-number) (list week-day-number))))))
-    ;; I also know about the @var{locale-day-short} method, but I need
-    ;; strings of length 2.
-    (if truncate-to
-        (string-take str truncate-to)
-        str)))
-
-(define*-public (datetime->string datetime optional: (fmt "~Y-~m-~dT~H:~M:~S") key: allow-unknown?)
-  (define date (get-date datetime))
-  (define time ((@ (datetime) get-time%) datetime))
-  (with-output-to-string
-    (lambda ()
-      (fold (lambda (token state)
-              (case state
-                ((#\~)
-                 (case token
-                   ((#\~) (display "~"))
-                   ((#\H) (format #t "~2'0d" (hour time)))
-                   ((#\k) (format #t "~2' d" (hour time)))
-                   ((#\M) (format #t "~2'0d" (minute time)))
-                   ((#\S) (format #t "~2'0d" (second time)))
-                   ((#\Y) (format #t "~4'0d" (year date)))
-                   ((#\m) (format #t "~2'0d" (month date)))
-                   ((#\d) (format #t "~2'0d" (day date)))
-                   ;; Should be same as ~_d
-                   ((#\s) (display (datetime->unix-time datetime))) ; epoch time!
-                   ((#\e) (format #t "~2' d" (day date)))
-                   ((#\1) (format #t "~4'0d-~2'0d-~2'0d"
-                                  (year date) (month date) (day date)))
-                   ((#\3) (format #t "~2'0d:~2'0d:~2'0d"
-                                  (hour time) (minute time) (second time)))
-                   ((#\A) (display (week-day-name (week-day date))))
-                   ((#\a) (display (week-day-name (week-day date) 3)))
-                   ((#\b) (display (locale-month-short (month date))))
-                   ((#\B) (display (locale-month (month date))))
-                   ((#\Z) (when (equal? "UTC" (get-timezone datetime)) (display "Z")))
-                   (else (unless allow-unknown?
-                           (error 'datetime->string "Invalid format token ~a" token))))
-                 #f)
-                (else (unless (char=? #\~ token) (display token)) token)))
-            #f
-            (string->list fmt)))))
-
-(define*-public (date->string date optional: (fmt "~Y-~m-~d") key: allow-unknown?)
-  (datetime->string (datetime date: date) fmt allow-unknown?: allow-unknown?))
-
-(define*-public (time->string time optional: (fmt "~H:~M:~S") key: allow-unknown?)
-  (datetime->string (datetime time: time) fmt allow-unknown?: allow-unknown?))
-
-
-;; @verbatim
-;;    A          B          C          D          E         ¬F
-;; |s1|     :     |s2| : |s1|     :     |s2| :          : |s1|
-;; |  |     :     |  | : |  ||s2| : |s1||  | : |s1||s2| : |  |
-;; |  ||s2| : |s1||  | : |  ||  | : |  ||  | : |  ||  | :
-;;     |  | : |  |     : |  ||  | : |  ||  | : |  ||  | :     |s2|
-;;     |  | : |  |     : |  |     :     |  | :          :     |  |
-;;
-;; Infinitely short ---+|s2| : |s1|+--- : two instants don't overlap
-;; events, overlap   s1      :      s2  :
-;; @end verbatim
-;; 
-;; E is covered by both case A and B.
-(define-public (timespan-overlaps? s1-begin s1-end s2-begin s2-end)
-  "Return whetever or not two timespans overlap."
-  (or
-   ;; A
-   (and (date/-time<? s2-begin s1-end)
-        (date/-time<? s1-begin s2-end))
-
-   ;; B
-   (and (date/-time<? s1-begin s2-end)
-        (date/-time<? s2-begin s1-end))
-
-   ;; C
-   (and (date/-time<=? s1-begin s2-begin)
-        (date/-time<? s2-end s1-end))
-
-   ;; D
-   (and (date/-time<=? s2-begin s1-begin)
-        (date/-time<? s1-end s2-end))))
-
-(define-public (add-day d)
-  (date+ d (date day: 1)))
-
-(define-public (remove-day d)
-  (date- d (date day: 1)))
-
-(define-public (in-date-range? start-date end-date)
-  (lambda (date)
-    (date<= start-date date end-date)))
-
-;; Returns a list of the seven week days, with @var{week-start}
-;; as the beginning of the week.
-;; @example
-;; (weekday-list sun)
-;; => (0 1 2 3 4 5 6)
-;; @end example
-(define-public (weekday-list week-start)
-  (take (drop (apply circular-list (iota 7))
-              week-start)
-        7))
-
-;; returns the date the week containing d started.
-;; (start-of-week #2020-04-02 sun) ; => 2020-03-29
-(define*-public (start-of-week d optional: (week-start (week-start)))
-  (date- d (date day: (modulo (- (week-day d)
-                                 week-start)
-                              7))))
-
-;; (end-of-week #2020-04-01 mon)
-;; => 2020-04-05
-(define*-public (end-of-week d optional: (week-start (week-start)))
-  (date+ (start-of-week d week-start)
-         (date day: 6)))
-
-
-;; Given a month and and which day the week starts on,
-;; returns three lists, which are:
-;; The days leading up to the current month, but share a week
-;; The days in the current month
-;; The days after the current month, but which shares a week.
-;; 
-;;       mars 2020
-;; må ti on to fr lö sö
-;;                    1
-;;  2  3  4  5  6  7  8
-;;  9 10 11 12 13 14 15
-;; 16 17 18 19 20 21 22
-;; 23 24 25 26 27 28 29
-;; 30 31
-;; @lisp
-;; (month-days #2020-03-01 mon)
-;; ; ⇒ (2020-02-24 ... 2020-02-29)
-;; ; ⇒ (2020-03-01 ... 2020-03-31)
-;; ; ⇒ (2020-04-01 ... 2020-04-05)
-;; @end lisp
-;; Ignores day component of @var{date}.
-(define*-public (month-days date optional: (week-start (week-start)))
-  (let* ((month-len (days-in-month date))
-         (prev-month-len (days-in-month (month- date)))
-         (month-start (modulo (- (week-day date) week-start) 7)))
-    (values
-     (map (lambda (d) (set (day (month- date)) d))
-          (iota month-start (1+ (- prev-month-len month-start))))
-     (map (lambda (d) (set (day date) d)) (iota month-len 1))
-     (map (lambda (d) (set (day (month+ date)) d))
-          (iota (modulo (- (* 7 5) month-len month-start) 7) 1)))))
-
-
-
-
-(define-public (days-in-interval start-date end-date)
-  (let ((diff (date-difference (date+ end-date (date day: 1)) start-date)))
-    (with-streams
-     (fold + (day diff)
-           (map days-in-month
-                (take (+ (month diff)
-                         (* 12 (year diff)))
-                      (month-stream start-date)))))))
-
-;; Day from start of the year, so 1 feb would be day 32.
-;; Also known as Julian day.
-(define-public (year-day date)
-  (days-in-interval (start-of-year date) date))
-
-
-;; @example
-;; (time->decimal-hour #10:30:00) ; => 10.5
-;; @end example
-(define-public (time->decimal-hour time)
-  (exact->inexact (+ (hour time)
-                     (/ (minute time) 60)
-                     (/ (second time) 3600))))
-
-(define*-public (datetime->decimal-hour dt optional: start-date)
-
-  (let ((date-diff
-         (cond [start-date
-                (let* ((end-date (date+ start-date (get-date dt))))
-                  (days-in-interval start-date end-date)) ]
-               [(or (not (zero? (month (get-date dt))))
-                    (not (zero? (year (get-date dt)))))
-                (error "Multi-month intervals only supported when start-date is given" dt)]
-               [else (day (get-date dt))])))
-    (+ (time->decimal-hour ((@ (datetime) get-time%) dt))
-       (* (1- date-diff) 24))))
-
-;; Returns a list of all dates from start to end.
-;; both inclusive
-;; date, date → [list date]
-(define-public (date-range start end)
-  (stream->list
-   (stream-take-while (lambda (d) (date<= d end))
-                      (day-stream start))))
-
-
-
-;; Returns the first instance of the given week-day after @var{d}.
-;; @example
-;; (find-first-week-day mon #2020-04-01)
-;; => #2020-04-06
-;; (find-first-week-day mon #2020-04-10)
-;; => #2020-04-13
-;; (find-first-week-day mon #2020-04-30)
-;; => #2020-05-04
-;; @end example
-(define-public (find-first-week-day wday d)
-  (let* ((start-day (week-day d))
-         (diff (- wday start-day)))
-    (date+ d (date day: (modulo diff 7)))))
-
-;; returns instances of the given week-day in month between
-;; month-date and end of month.
-;; @example
-;; (all-wday-in-month mon #2020-06-01)
-;; => (#2020-06-01 #2020-06-08 #2020-06-15 #2020-06-22 #2020-06-29)
-;; (all-wday-in-month mon #2020-06-10)
-;; => (#2020-06-15 #2020-06-22 #2020-06-29)
-;; @end example
-;; week-day, date → (list date)
-(define-public (all-wday-in-month wday month-date)
-  (stream->list
-   (stream-take-while
-    (lambda (d) (= (month d) (month month-date)))
-    (week-stream (find-first-week-day wday month-date)))))
-
-
-(define-public (all-wday-in-year wday year-date)
-  (stream->list
-   (stream-take-while
-    (lambda (d) (= (year d) (year year-date)))
-    (week-stream (find-first-week-day wday year-date)))))
diff --git a/module/datetime/zic.scm b/module/datetime/zic.scm
index 8035570a..37051945 100644
--- a/module/datetime/zic.scm
+++ b/module/datetime/zic.scm
@@ -12,7 +12,6 @@
   :use-module (util)
   :use-module (util exceptions)
   :use-module (datetime)
-  :use-module (datetime util)
   :use-module (datetime timespec)
   :use-module (ice-9 rdelim)
   :use-module (srfi srfi-1)
diff --git a/module/entry-points/html.scm b/module/entry-points/html.scm
index e58cbddd..e30dc7c1 100644
--- a/module/entry-points/html.scm
+++ b/module/entry-points/html.scm
@@ -7,7 +7,6 @@
   :use-module (util options)
   ;; :use-module (vcomponent)
   :use-module (datetime)
-  :use-module (datetime util)
   :use-module (ice-9 getopt-long)
   )
 
diff --git a/module/entry-points/ical.scm b/module/entry-points/ical.scm
index 0583be49..997621b2 100644
--- a/module/entry-points/ical.scm
+++ b/module/entry-points/ical.scm
@@ -5,7 +5,6 @@
   :use-module (output ical)
   :use-module (ice-9 getopt-long)
   :use-module (datetime)
-  :use-module (datetime util)
   )
 
 (define opt-spec
diff --git a/module/entry-points/server.scm b/module/entry-points/server.scm
index aaff398e..bd30033b 100644
--- a/module/entry-points/server.scm
+++ b/module/entry-points/server.scm
@@ -29,7 +29,6 @@
 
   :use-module (vcomponent)
   :use-module (datetime)
-  :use-module (datetime util)
   :use-module (output html)
   :use-module (output ical)
 
diff --git a/module/entry-points/terminal.scm b/module/entry-points/terminal.scm
index 7f816e94..d44fb1e8 100644
--- a/module/entry-points/terminal.scm
+++ b/module/entry-points/terminal.scm
@@ -4,7 +4,6 @@
   :use-module (vcomponent)
   :use-module (ice-9 getopt-long)
   :use-module (datetime)
-  :use-module (datetime util)
   :use-module (vulgar)
   :use-module (util options)
   )
diff --git a/module/main.scm b/module/main.scm
index 4067bd82..9fe9d8c6 100644
--- a/module/main.scm
+++ b/module/main.scm
@@ -194,7 +194,7 @@
     (format (logport) "<?xml version=\"1.0\" encoding=\"UTF-8\"?>~%"))
 
   (format (logport) "<run><start>~a</start>~%"
-          ((@ (datetime util) datetime->string)
+          ((@ (datetime) datetime->string)
            ((@ (datetime) current-datetime))))
   (report-time! "Program start")
   ;; ((@ (util config) print-configuration-documentation))
diff --git a/module/output/html.scm b/module/output/html.scm
index f462db56..df255a25 100644
--- a/module/output/html.scm
+++ b/module/output/html.scm
@@ -13,7 +13,6 @@
   #:use-module (util tree)
   #:duplicates (last)
   #:use-module (datetime)
-  #:use-module (datetime util)
   #:use-module (output general)
   #:use-module (ice-9 curried-definitions)
   #:use-module (ice-9 match)
diff --git a/module/output/ical.scm b/module/output/ical.scm
index 7e514c99..4822bf4a 100644
--- a/module/output/ical.scm
+++ b/module/output/ical.scm
@@ -8,7 +8,6 @@
   :use-module (vcomponent datetime)
   :use-module (srfi srfi-1)
   :use-module (datetime)
-  :use-module (datetime util)
   :use-module (srfi srfi-41)
   :use-module (srfi srfi-41 util)
   :use-module (datetime zic)
diff --git a/module/output/sxml-types.scm b/module/output/sxml-types.scm
index bd7253fd..86859ce1 100644
--- a/module/output/sxml-types.scm
+++ b/module/output/sxml-types.scm
@@ -2,7 +2,6 @@
   :use-module (util)
   :use-module (output types)
   :use-module (datetime)
-  :use-module (datetime util)
   :use-module (output common)
   )
 
diff --git a/module/output/terminal.scm b/module/output/terminal.scm
index 14777437..c5c1323d 100644
--- a/module/output/terminal.scm
+++ b/module/output/terminal.scm
@@ -2,7 +2,6 @@
   #:use-module (output general)
   #:use-module (srfi srfi-1)
   #:use-module (datetime)
-  #:use-module (datetime util)
   #:use-module (srfi srfi-26)
   #:use-module (srfi srfi-41)
   #:use-module (srfi srfi-41 util)
diff --git a/module/output/types.scm b/module/output/types.scm
index e5829ccf..8eff2ee6 100644
--- a/module/output/types.scm
+++ b/module/output/types.scm
@@ -3,8 +3,7 @@
   :use-module (util)
   :use-module (util exceptions)
   :use-module (util base64)
-  :use-module (datetime)
-  :use-module (datetime util))
+  :use-module (datetime))
 
 
 (define (write-binary _ value)
diff --git a/module/output/xcal.scm b/module/output/xcal.scm
index eb244921..425865a5 100644
--- a/module/output/xcal.scm
+++ b/module/output/xcal.scm
@@ -7,7 +7,6 @@
   :use-module (ice-9 match)
   :use-module (output common)
   :use-module (datetime)
-  :use-module (datetime util)
   :use-module (srfi srfi-1)
   )
 
diff --git a/module/vcomponent.scm b/module/vcomponent.scm
index 0020b864..f9d04d35 100644
--- a/module/vcomponent.scm
+++ b/module/vcomponent.scm
@@ -6,7 +6,6 @@
   :use-module (srfi srfi-41)
   :use-module (srfi srfi-41 util)
   :use-module (datetime)
-  :use-module (datetime util)
   :use-module (vcomponent base)
   :use-module (vcomponent parse)
   :use-module ((vcomponent recurrence) :select (generate-recurrence-set repeating?))
diff --git a/module/vcomponent/datetime.scm b/module/vcomponent/datetime.scm
index 85b37d6d..3f81c359 100644
--- a/module/vcomponent/datetime.scm
+++ b/module/vcomponent/datetime.scm
@@ -3,7 +3,6 @@
   #:use-module (vcomponent base)
   #:use-module (datetime)
   #:use-module (datetime timespec)
-  #:use-module (datetime util)
   #:use-module (datetime zic)
   #:use-module (util)
 
diff --git a/module/vcomponent/group.scm b/module/vcomponent/group.scm
index 76aed2fd..d23787ef 100644
--- a/module/vcomponent/group.scm
+++ b/module/vcomponent/group.scm
@@ -2,7 +2,6 @@
   #:use-module (vcomponent)
   #:use-module (vcomponent datetime)
   #:use-module (datetime)
-  #:use-module (datetime util)
   #:use-module (srfi srfi-41)
   #:use-module (srfi srfi-41 util)
   #:export (group-stream get-groups-between))
diff --git a/module/vcomponent/recurrence/display.scm b/module/vcomponent/recurrence/display.scm
index ff47d104..1df95d0b 100644
--- a/module/vcomponent/recurrence/display.scm
+++ b/module/vcomponent/recurrence/display.scm
@@ -10,8 +10,11 @@
   :use-module (vcomponent recurrence internal)
   :use-module (text util)
   :use-module (text numbers)
-  :use-module ((datetime) :select (time))
-  :use-module (datetime util)
+  :use-module ((datetime) :select (time time->string
+                                        datetime->string
+                                        week-day-name
+                                        locale-month
+                                        ))
   )
 
 
diff --git a/module/vcomponent/recurrence/generate.scm b/module/vcomponent/recurrence/generate.scm
index 3da26272..711f51ec 100644
--- a/module/vcomponent/recurrence/generate.scm
+++ b/module/vcomponent/recurrence/generate.scm
@@ -10,7 +10,6 @@
   :use-module (vcomponent recurrence parse)
 
   :use-module (datetime)
-  :use-module (datetime util)
   :use-module (ice-9 curried-definitions) )
 
 
diff --git a/module/vcomponent/recurrence/internal.scm b/module/vcomponent/recurrence/internal.scm
index 40195895..ec8c10d4 100644
--- a/module/vcomponent/recurrence/internal.scm
+++ b/module/vcomponent/recurrence/internal.scm
@@ -3,7 +3,6 @@
 
   #:use-module (srfi srfi-88)           ; better keywords
   #:use-module ((vcomponent base) :select (prop))
-  #:use-module (datetime util)
   #:use-module (srfi srfi-9)
   #:use-module (srfi srfi-9 gnu)
   #:use-module (util)
diff --git a/module/vcomponent/recurrence/parse.scm b/module/vcomponent/recurrence/parse.scm
index efcf984c..a6a3ef9c 100644
--- a/module/vcomponent/recurrence/parse.scm
+++ b/module/vcomponent/recurrence/parse.scm
@@ -5,7 +5,6 @@
 
   #:use-module (srfi srfi-1)
   #:use-module (datetime)
-  #:use-module (datetime util)
   #:use-module (srfi srfi-26)
   #:use-module (vcomponent recurrence internal)
   #:use-module (util)
diff --git a/module/vulgar/termios.scm b/module/vulgar/termios.scm
index 554e09da..3fe82f92 100644
--- a/module/vulgar/termios.scm
+++ b/module/vulgar/termios.scm
@@ -132,7 +132,7 @@
 
 (define-once lib (dynamic-link))
 
-(define-foreign (tcsetattr int *) → int
+(define-foreign (tcsetattr int int *) → int
   (dynamic-func "tcsetattr" lib))
 
 (define* (tcsetattr! termios  #:optional
diff --git a/tests/datetime-util.scm b/tests/datetime-util.scm
index 80a8df5e..123229c7 100644
--- a/tests/datetime-util.scm
+++ b/tests/datetime-util.scm
@@ -1,5 +1,5 @@
-(((datetime) date time datetime)
- ((datetime util) month-stream in-date-range? timespan-overlaps?)
+(((datetime) date time datetime
+  month-stream in-date-range? timespan-overlaps?)
  ((srfi srfi-41) stream->list stream-take
   ))
 
diff --git a/tests/recurrence-rule.scm b/tests/recurrence-rule.scm
index 303b4547..58daaa9b 100644
--- a/tests/recurrence-rule.scm
+++ b/tests/recurrence-rule.scm
@@ -1,7 +1,7 @@
 (((vcomponent recurrence parse) parse-recurrence-rule)
  ((vcomponent recurrence internal)
   make-recur-rule weekdays intervals)
- ((datetime util) mon))
+ ((datetime) mon))
 
 
 (test-equal
diff --git a/tests/recurrence.scm b/tests/recurrence.scm
index fad8e7dc..a3720ce8 100644
--- a/tests/recurrence.scm
+++ b/tests/recurrence.scm
@@ -10,7 +10,8 @@
  ((vcomponent recurrence display) format-recurrence-rule)
  ((vcomponent recurrence internal) count until)
  ((vcomponent base) make-vcomponent prop prop* extract)
- ((datetime) parse-ics-datetime datetime time date)
+ ((datetime) parse-ics-datetime datetime time date
+  datetime->string)
  ((util) -> mod!)
  ((guile) set!)
  ((srfi srfi-41) stream->list)
diff --git a/tests/recurring.scm b/tests/recurring.scm
index 3922f1b6..a6b60dc7 100644
--- a/tests/recurring.scm
+++ b/tests/recurring.scm
@@ -1,5 +1,5 @@
 (((srfi srfi-41) stream-take stream-map stream->list stream-car)
- ((datetime util) day-stream)
+ ((datetime) day-stream)
  ((vcomponent base) extract prop)
 
  ((vcomponent) parse-calendar)
diff --git a/tests/rrule-parse.scm b/tests/rrule-parse.scm
index 12ba93fd..c10266aa 100644
--- a/tests/rrule-parse.scm
+++ b/tests/rrule-parse.scm
@@ -1,7 +1,7 @@
 (((vcomponent recurrence parse)
   parse-recurrence-rule)
  ((vcomponent recurrence) make-recur-rule)
- ((datetime util) mon)
+ ((datetime) mon)
  ((util exceptions) warnings-are-errors warning-handler)
  )
 
-- 
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