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to Gigasecond in the Clojure Track

Published at Dec 12 2020 · 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

(defn from [& date]
  (let [[y m d] date
        start (GregorianCalendar. y (dec m) d)
        formatter (SimpleDateFormat. "yyyy MM dd")]
    (.add start Calendar/SECOND (int 1E+09))
     (.getTime start)
     (.format formatter)
     (re-seq #"\d+")
     (map #(Integer/parseInt %)))))

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