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I have a list of Dates that looks like this:

I/System.out: TAG: Mon Jun 20 15:36:00 GMT+02:00 2022
I/System.out: TAG: Mon Jun 20 15:51:55 GMT+02:00 2022
I/System.out: TAG: Mon Jun 20 15:52:14 GMT+02:00 2022
I/System.out: TAG: Mon Jun 20 16:24:01 GMT+02:00 2022
I/System.out: TAG: Mon Jun 20 18:39:07 GMT+02:00 2022
I/System.out: TAG: Mon Jun 20 18:49:02 GMT+02:00 2022
I/System.out: TAG: Mon Jun 20 20:24:26 GMT+02:00 2022
I/System.out: TAG: Mon Jun 20 20:52:23 GMT+02:00 2022
I/System.out: TAG: Mon Jun 20 22:41:50 GMT+02:00 2022
I/System.out: TAG: Mon Jun 20 22:55:54 GMT+02:00 2022

How do I calculate to subtract each i+1 element from the i element(example: TAG: Mon Jun 20 15:51:55 GMT+02:00 2022 - TAG: Mon Jun 20 15:36:00 GMT+02:00 2022) difference is 21 minutes.

I tryed something like this:

 for(int i=0;i<list.size()-1;i++){
                     parked += list.get(i+1).getTime() - list.get(i).getTime();
                    }
System.out.println("parked time:  "+parked / 60 000);

and I get 434 minutes instead of 98... Can someone help? Thanks in regards

Nikola Stankovic
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    Does this answer your question? [Calculate date/time difference in java](https://stackoverflow.com/questions/5351483/calculate-date-time-difference-in-java) – R7G Jul 18 '22 at 09:41
  • What kind of objects do you store in your list? What is the return type of `getTime()` ? – Eritrean Jul 18 '22 at 09:44
  • In my list there is a list of dates as above – Nikola Stankovic Jul 18 '22 at 09:46
  • In my list I insert Date objects, long in milliseconds @Eritrean – Nikola Stankovic Jul 18 '22 at 09:47
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    it is strongly advised to NOT use `java.util.Date` anymore; use classes from the `java.time` package! Anyway, you can do `Duration.between(d1.toInstant(), d2.toInstant()).toMinutes()` to get the difference between Dates `d1` and `d2` – user16320675 Jul 18 '22 at 10:23
  • Use `OffsetDateTime` (or `ZonedDateTime`) and `ChronoUnit.MINUTES.between()`. – Ole V.V. Jul 18 '22 at 10:55

2 Answers2

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By looking at your question i found this other post that is able to solve your issue. The code presented as solution is able to convert Date to simple readable values.

Calculating the difference between two Java date instances

/**
 * Get a diff between two dates
 * @param date1 the oldest date
 * @param date2 the newest date
 * @param timeUnit the unit in which you want the diff
 * @return the diff value, in the provided unit
 */
public static long getDateDiff(Date date1, Date date2, TimeUnit timeUnit) {
    long diffInMillies = date2.getTime() - date1.getTime();
    return timeUnit.convert(diffInMillies,TimeUnit.MILLISECONDS);
}

Then you need to call to obtain your value

getDateDiff(date1,date2,TimeUnit.MINUTES);
DoktorSAS
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Try this

public double  findDifference(String start_date, String end_date)
{
    // SimpleDateFormat converts the
    // string format to date object
   SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
   double diff = 0;
    // Try Block
    try {
        // parse method is used to parse
        // the text from a string to
        // produce the date
        Date d1 = sdf.parse(start_date);
        Date d2 = sdf.parse(end_date);
        // Calucalte time difference
        // in milliseconds
        long difference_In_Time = d2.getTime() - d1.getTime();

        // Calucalte time difference in
        // seconds, minutes, hours, years,
        // and days
        long difference_In_Seconds = (difference_In_Time / 1000) % 60;

        long difference_In_Minutes = (difference_In_Time / (1000 * 60)) % 60;

        long day   = (difference_In_Time / (1000 * 60 * 60)) % 24;

        long difference_In_Years = (difference_In_Time / (1000L * 60 * 60 * 24 * 365));

        long difference_In_Days = (difference_In_Time / (1000 * 60 * 60 * 24)) % 365;

        // Print the date difference in
        // years, in days, in hours, in
        // minutes, and in seconds
    }

    // Catch the Exception
    catch (ParseException e) {
        e.printStackTrace();
    }
    return diff;
}
Praveen Kumar
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