 # TkachukPavel's solution

## to Gigasecond in the Clojure Track

Published at Jan 17 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 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)]))``````

### What can you learn from this solution?

A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.

Here are some questions to help you reflect on this solution and learn the most from it.

• What compromises have been made?
• Are there new concepts here that you could read more about to improve your understanding?