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TkachukPavel's solution

to Gigasecond in the Clojure Track

Published at Jan 17 2021 · 0 comments
Test suite

Given a moment, determine the moment that would be after a gigasecond has passed.

A gigasecond is 10^9 (1,000,000,000) seconds.


Chapter 9 in Chris Pine's online Learn to Program tutorial. http://pine.fm/LearnToProgram/?Chapter=09

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.


(ns gigasecond-test
  (:require [clojure.test :refer [deftest is]]

(deftest from-apr-25-2011
  (is (= [2043 1 1] (gigasecond/from 2011 4 25))))

(deftest from-jun-13-1977
  (is (= [2009 2 19] (gigasecond/from 1977 6 13))))

(deftest from-jul-19-1959
  (is (= [1991 3 27] (gigasecond/from 1959 7 19))))

;; customize this to test your birthday and find your gigasecond date:
;; (deftest your-birthday
;;   (is (= [year2 month2 day2] (gigasecond/from year1 month1 day1))))
(ns gigasecond
  (:import (java.util Calendar)))

(defn from [year month day]  ;; <- arglist goes here
  (let [now (doto (Calendar/getInstance)
              (.set year (dec month) day))
        then (doto now
               (.setTimeInMillis (+ (long 1e12) (.getTimeInMillis now))))]
    [(.get then Calendar/YEAR)
     (inc (.get then Calendar/MONTH))
     (.get then Calendar/DAY_OF_MONTH)]))

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