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;;; Commentary:
;; Tests that datetime->unix-time correctly converts between Olssen
;; timezone definitions (e.g. Europe/Stockholm), into correct times
;; and offsets (in unix time).
;; Also indirectly tests the Zone Info Compiler (datetime zic), since
;; the zoneinfo comes from there.
;;; Code:
(define-module (test tz)
:use-module (srfi srfi-64)
:use-module (srfi srfi-88)
:use-module ((datetime)
:select (parse-ics-datetime
datetime
date
time
datetime->unix-time
unix-time->datetime
get-datetime))
:use-module ((hnh util env) :select (let-env)))
;; London alternates between +0000 and +0100
(let-env
((TZ "Europe/London"))
(test-equal
"London winter"
#2020-01-12T13:30:00
(get-datetime
(parse-ics-datetime "20200112T133000Z")))
(test-equal
"London summer"
#2020-06-12T14:30:00
(get-datetime
(parse-ics-datetime "20200612T133000Z"))))
;; Stockholm alternates between +0100 and +0200
(let-env
((TZ "Europe/Stockholm"))
(test-equal
"Stockholm winter"
#2020-01-12T14:30:00
(get-datetime
(parse-ics-datetime "20200112T133000Z")))
(test-equal
"Stockholm summer"
#2020-06-12T15:30:00
(get-datetime
(parse-ics-datetime "20200612T133000Z"))))
(test-equal
-10800
(datetime->unix-time
(parse-ics-datetime
"19700101T000000"
"Europe/Tallinn")))
(test-equal
-3600
(datetime->unix-time
(parse-ics-datetime
"19700101T000000"
"Europe/Stockholm")))
(test-equal
0
(datetime->unix-time
(parse-ics-datetime "19700101T000000Z")))
;; yes, really
(test-equal
-3600
(datetime->unix-time
(parse-ics-datetime
"19700101T000000"
"Europe/London")))
(test-equal
(datetime
date:
#1970-01-01
time:
#00:00:00
tz:
"UTC")
(unix-time->datetime 0))
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