My attempts at exercism.org
feat(php): gigasecond
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php/gigasecond/Gigasecond.php
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php/gigasecond/Gigasecond.php
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php/gigasecond/GigasecondTest.php
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php/gigasecond/GigasecondTest.php
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<?php
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declare(strict_types=1);
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use PHPUnit\Framework\TestCase;
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use PHPUnit\Framework\Attributes\TestDox;
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/**
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* ATTENTION: We use function `from()` for backwards compatibility, not `add()`
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*/
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class GigasecondTest extends TestCase
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{
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public static function setUpBeforeClass(): void
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{
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require_once 'Gigasecond.php';
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}
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/** uuid: 92fbe71c-ea52-4fac-bd77-be38023cacf7 */
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#[TestDox('Date only specification of time')]
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public function testDateOnlySpecificationOfTime(): void
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{
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$UTC = new DateTimeZone('UTC');
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$input = new DateTimeImmutable('2011-04-25', $UTC);
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$actual = from($input);
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$this->assertInstanceOf(DateTimeImmutable::class, $actual);
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$this->assertSame(
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'2043-01-01 01:46:40',
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$actual->format('Y-m-d H:i:s'),
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);
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}
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/** uuid: 6d86dd16-6f7a-47be-9e58-bb9fb2ae1433 */
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#[TestDox('Second test for date only specification of time')]
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public function testSecondTestForDateOnlySpecificationOfTime(): void
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{
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$UTC = new DateTimeZone('UTC');
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$input = new DateTimeImmutable('1977-06-13', $UTC);
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$actual = from($input);
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$this->assertInstanceOf(DateTimeImmutable::class, $actual);
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$this->assertSame(
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'2009-02-19 01:46:40',
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$actual->format('Y-m-d H:i:s'),
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);
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}
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/** uuid: 77eb8502-2bca-4d92-89d9-7b39ace28dd5 */
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#[TestDox('Third test for date only specification of time')]
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public function testThirdTestForDateOnlySpecificationOfTime(): void
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{
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$UTC = new DateTimeZone('UTC');
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$input = new DateTimeImmutable('1959-07-19', $UTC);
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$actual = from($input);
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$this->assertInstanceOf(DateTimeImmutable::class, $actual);
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$this->assertSame(
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'1991-03-27 01:46:40',
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$actual->format('Y-m-d H:i:s'),
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);
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}
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/** uuid: c9d89a7d-06f8-4e28-a305-64f1b2abc693 */
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#[TestDox('Full time specified')]
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public function testFullTimeSpecified(): void
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{
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$UTC = new DateTimeZone('UTC');
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$input = new DateTimeImmutable('2015-01-24 22:00:00', $UTC);
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$actual = from($input);
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$this->assertInstanceOf(DateTimeImmutable::class, $actual);
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$this->assertSame(
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'2046-10-02 23:46:40',
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$actual->format('Y-m-d H:i:s'),
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);
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}
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/** uuid: 09d4e30e-728a-4b52-9005-be44a58d9eba */
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#[TestDox('Full time with day roll-over')]
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public function testFullTimeWithDayRollOver(): void
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{
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$UTC = new DateTimeZone('UTC');
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$input = new DateTimeImmutable('2015-01-24 23:59:59', $UTC);
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$actual = from($input);
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$this->assertInstanceOf(DateTimeImmutable::class, $actual);
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$this->assertSame(
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'2046-10-03 01:46:39',
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$actual->format('Y-m-d H:i:s'),
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);
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}
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}
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php/gigasecond/README.md
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php/gigasecond/README.md
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# Gigasecond
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Welcome to Gigasecond on Exercism's PHP Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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## Introduction
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The way we measure time is kind of messy.
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We have 60 seconds in a minute, and 60 minutes in an hour.
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This comes from ancient Babylon, where they used 60 as the basis for their number system.
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We have 24 hours in a day, 7 days in a week, and how many days in a month?
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Well, for days in a month it depends not only on which month it is, but also on what type of calendar is used in the country you live in.
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What if, instead, we only use seconds to express time intervals?
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Then we can use metric system prefixes for writing large numbers of seconds in more easily comprehensible quantities.
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- A food recipe might explain that you need to let the brownies cook in the oven for two kiloseconds (that's two thousand seconds).
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- Perhaps you and your family would travel to somewhere exotic for two megaseconds (that's two million seconds).
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- And if you and your spouse were married for _a thousand million_ seconds, you would celebrate your one gigasecond anniversary.
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~~~~exercism/note
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If we ever colonize Mars or some other planet, measuring time is going to get even messier.
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If someone says "year" do they mean a year on Earth or a year on Mars?
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The idea for this exercise came from the science fiction novel ["A Deepness in the Sky"][vinge-novel] by author Vernor Vinge.
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In it the author uses the metric system as the basis for time measurements.
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[vinge-novel]: https://www.tor.com/2017/08/03/science-fiction-with-something-for-everyone-a-deepness-in-the-sky-by-vernor-vinge/
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~~~~
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## Instructions
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Your task is to determine the date and time one gigasecond after a certain date.
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A gigasecond is one thousand million seconds.
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That is a one with nine zeros after it.
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If you were born on _January 24th, 2015 at 22:00 (10:00:00pm)_, then you would be a gigasecond old on _October 2nd, 2046 at 23:46:40 (11:46:40pm)_.
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## Source
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### Contributed to by
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- @arueckauer
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- @dkinzer
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- @Dog
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- @kunicmarko20
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- @kytrinyx
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- @lafent
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- @MatheusNaldi
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- @petemcfarlane
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- @peteraba
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- @TFarla
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- @tstirrat15
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- @zembrowski
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### Based on
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Chapter 9 in Chris Pine's online Learn to Program tutorial. - https://pine.fm/LearnToProgram/chap_09.html