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| author | Hugo Hörnquist <hugo@hornquist.se> | 2019-04-22 01:56:13 +0200 |
|---|---|---|
| committer | Hugo Hörnquist <hugo@hornquist.se> | 2019-04-22 01:56:13 +0200 |
| commit | 84b0930b8e2396fd8e967a0937591f031f0d79e3 (patch) | |
| tree | 129f59e880b3d68c076d43808f759674f9c424ec | |
| parent | Move where streams are merged. (diff) | |
| download | calp-84b0930b8e2396fd8e967a0937591f031f0d79e3.tar.gz calp-84b0930b8e2396fd8e967a0937591f031f0d79e3.tar.xz | |
Add some date generating procedures.
| -rw-r--r-- | module/srfi/srfi-19/util.scm | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/module/srfi/srfi-19/util.scm b/module/srfi/srfi-19/util.scm index 3126be77..928f9abb 100644 --- a/module/srfi/srfi-19/util.scm +++ b/module/srfi/srfi-19/util.scm @@ -2,6 +2,7 @@ #:use-module (srfi srfi-9 gnu) #:use-module (srfi srfi-19) #:use-module (srfi srfi-19 setters) + #:use-module (srfi srfi-41) #:export (copy-date drop-time! drop-time in-day? today? @@ -87,3 +88,15 @@ attribute set to 0. Can also be seen as \"Start of day\"" ;; D (and (time<? s2-begin s1-begin) (time<? s1-end s2-end)))) + +(define-public (normalize-date date) + (time-utc->date (date->time-utc date) + (zone-offset date))) + +;; Returns a stream of date objects, one day appart, staring from start-day. +(define-public (day-stream start-day) + (stream-iterate + (lambda (d) + (set! (day d) (1+ (day d))) + (normalize-date d)) + start-day)) |