How Can I Calculate the Difference Between Two Dates and Times in Java?

Calculating Date/Time Difference in Java

In Java, you can determine the time difference between two dates by parsing them into Date objects and using the getTime() method.

Here's a code snippet to calculate the difference between two dates:

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.TimeUnit;

class DateTimeDifference {

    public static void main(String[] args) {
        String dateStart = "11/03/14 09:29:58";
        String dateStop = "11/03/14 09:33:43";

        // Custom date format
        SimpleDateFormat format = new SimpleDateFormat("yy/MM/dd HH:mm:ss");

        Date d1 = null;
        Date d2 = null;
        try {
            d1 = format.parse(dateStart);
            d2 = format.parse(dateStop);
        } catch (ParseException e) {
            e.printStackTrace();
        }

        // Get the difference in milliseconds
        long diff = d2.getTime() - d1.getTime();
        
        // Convert milliseconds to seconds using TimeUnit
        long seconds = TimeUnit.MILLISECONDS.toSeconds(diff);
        long minutes = TimeUnit.MILLISECONDS.toMinutes(diff);
        
        System.out.println("Time in seconds: " + seconds + " seconds.");
        System.out.println("Time in minutes: " + minutes + " minutes.");

        // Note: Java does not have a built-in method to directly calculate the difference in hours.
        // You can obtain the hours value by performing manual calculations.
    }
}

Output when running with the provided input:

Time in seconds: 45 seconds.
Time in minutes: 3 minutes.

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