Convert Seconds to Human Readable Time (HH:MM:SS) using Java

The challenge

Write a function, which takes a non-negative integer (seconds) as input and returns the time in a human-readable format (HH:MM:SS)

  • HH = hours, padded to 2 digits, range: 00 – 99
  • MM = minutes, padded to 2 digits, range: 00 – 59
  • SS = seconds, padded to 2 digits, range: 00 – 59

The maximum time never exceeds 359999 (99:59:59)

Test cases

import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class ExampleTest {
  @Test
  public void Tests() {
    assertEquals("makeReadable(0)", "00:00:00", HumanReadableTime.makeReadable(0));
    assertEquals("makeReadable(5)", "00:00:05", HumanReadableTime.makeReadable(5));
    assertEquals("makeReadable(60)", "00:01:00", HumanReadableTime.makeReadable(60));
    assertEquals("makeReadable(86399)", "23:59:59", HumanReadableTime.makeReadable(86399));
    assertEquals("makeReadable(359999)", "99:59:59", HumanReadableTime.makeReadable(359999));
  }
}

The solution in Java

public class HumanReadableTime {
  public static String makeReadable(int seconds) {
    
    return String.format("%02d:%02d:%02d", seconds / 3600, (seconds % 3600) / 60, (seconds % 60));
    
  }
}
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