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# rootulp's solution

## to Gigasecond in the Java Track

Published at Jul 13 2018 · 1 comment
Instructions
Test suite
Solution

#### Note:

This solution was written on an old version of Exercism. The tests below might not correspond to the solution code, and the exercise may have changed since this code was written.

Calculate the moment when someone has lived for 10^9 seconds.

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

# Running the tests

You can run all the tests for an exercise by entering

``````\$ gradle test
``````

in your terminal.

## 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.

### GigasecondTest.java

``````import org.junit.Test;
import org.junit.Ignore;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.Month;

import static org.junit.Assert.assertEquals;

public class GigasecondTest {

@Test
public void modernTime() {
Gigasecond gigaSecond = new Gigasecond(LocalDate.of(2011, Month.APRIL, 25));

assertEquals(LocalDateTime.of(2043, Month.JANUARY, 1, 1, 46, 40), gigaSecond.getDate());
}

@Ignore("Remove to run test")
@Test
public void afterEpochTime() {
Gigasecond gigaSecond = new Gigasecond(LocalDate.of(1977, Month.JUNE, 13));

assertEquals(LocalDateTime.of(2009, Month.FEBRUARY, 19, 1, 46, 40), gigaSecond.getDate());
}

@Ignore("Remove to run test")
@Test
public void beforeEpochTime() {
Gigasecond gigaSecond = new Gigasecond(LocalDate.of(1959, Month.JULY, 19));

assertEquals(LocalDateTime.of(1991, Month.MARCH, 27, 1, 46, 40), gigaSecond.getDate());
}

@Ignore("Remove to run test")
@Test
public void withFullTimeSpecified() {
Gigasecond gigaSecond = new Gigasecond(LocalDateTime.of(2015, Month.JANUARY, 24, 22, 0, 0));

assertEquals(LocalDateTime.of(2046, Month.OCTOBER, 2, 23, 46, 40), gigaSecond.getDate());
}

@Ignore("Remove to run test")
@Test
public void withFullTimeSpecifiedAndDayRollover() {
Gigasecond gigaSecond = new Gigasecond(LocalDateTime.of(2015, Month.JANUARY, 24, 23, 59, 59));

assertEquals(LocalDateTime.of(2046, Month.OCTOBER, 3, 1, 46, 39), gigaSecond.getDate());
}
}``````
``````import java.time.LocalDate;
import java.time.LocalDateTime;

public class Gigasecond {

private LocalDateTime now;
private static long GIGASECONDS = 1000000000L;

public Gigasecond(LocalDate localDate) {
this.now = localDate.atStartOfDay();
}

public Gigasecond(LocalDateTime localDateTime) {
this.now = localDateTime;
}

public LocalDateTime getDate() {
return now.plusSeconds(GIGASECONDS);
}

}``````

## Community comments

Find this solution interesting? Ask the author a question to learn more.

I think the name "now" is sorta confusing since it isn't actually the present date/time but rather the date/time of the person's gigasecond birthday.

### What can you learn from this solution?

A huge amount can be learned from reading other peopleโ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?