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lopz82's solution

to Gigasecond in the Clojure Track

Published at Jan 21 2021 · 0 comments
Instructions
Test suite
Solution

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

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

Source

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.

gigasecond_test.clj

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

(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.Date)
  (:import java.text.SimpleDateFormat))

(defn from-string [s]
  (.parse (SimpleDateFormat. "yyyy MM dd") s))

(defn parse-date [date]
  (-> (clojure.string/join " " date)
      from-string
      .getTime))

(defn extract-date [date]
  (let [date (new Date date)]
    [(+ 1900 (.getYear date))
     (+ 1 (.getMonth date))
     (.getDate date)]))

(defn from [& date]
  (-> (parse-date date)
      (+ 1000000000000)
      (extract-date)))

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