HerpDeDerp

import java.util.Scanner;

public class TimeDifference {
  // Accept user input for two integers expressing time in an HHMMSS format,
  // calculates the difference between the two timestamps, and returns an
  // integer also in a HHMMSS format
  public static void main(String[] args) {
    // Create a Scanner object
    Scanner input = new Scanner(System.in);

    // Prompt the user for and store the first timestamp
    System.out.print("Please enter the first timestamp (HHMMSS): ");
    int time1 = input.nextInt();

    // Repeat the above process for the second timestamp
    System.out.print("Please enter the second timestamp (HHMMSS): ");
    int time2 = input.nextInt();

    // Define constants for the number of seconds in a minute and hour
    final int SECONDS_IN_MINUTE = 60;
    final int SECONDS_IN_HOUR = 3600;

    // Seperate timestamps into their composite parts and convert to seconds
    // Conversion into seconds for the first timestamp
    int seconds1 = time1 % 100;
    int minutesInSeconds1 = ((time1 % 10000) / 100) * SECONDS_IN_MINUTE;
    int hoursInSeconds1 = (time1 / 10000) * SECONDS_IN_HOUR;
    int timestampInSeconds1 = hoursInSeconds1 + minutesInSeconds1 + seconds1;

    // Conversion into seconds for the second timestamp
    int seconds2 = time2 % 100;
    int minutesInSeconds2 = ((time2 % 10000) / 100) * SECONDS_IN_MINUTE;
    int hoursInSeconds2 = (time2 / 10000) * SECONDS_IN_HOUR;
    int timestampInSeconds2 = hoursInSeconds2 + minutesInSeconds2 + seconds2;

    // Calculate the difference between the two converted timestamps
    int timestampDifference = timestampInSeconds1 - timestampInSeconds2;

    // Convert difference in seconds back into the appropriate units
    int hoursDifference = timestampDifference / SECONDS_IN_HOUR;
    int minutesDifference = (timestampDifference % SECONDS_IN_HOUR) /
        SECONDS_IN_MINUTE;
    int secondsDifference = (timestampDifference % SECONDS_IN_HOUR) %
        SECONDS_IN_MINUTE;

    // Construct the final output as an integer
    int finalOutput = (hoursDifference * 10000) + (minutesDifference * 100) +
        secondsDifference;

    // Return the final output to the user
    System.out.println("The difference between the two timestamps is: " +
        finalOutput);
  }
}