Calculating date time difference in Java

Question

I have a code which calculates the difference between two dates in terms of hours/minutes/seconds. But when I am executing the below code, it is not giving me the accurate difference in seconds. Can someone suggest, where my code is going wrong?

String startDate = "11/03/14 09:29:58";
String stopDate = "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(startDate);
    d2 = format.parse(stopDate);
} catch (ParseException e) {
    e.printStackTrace();
}    

// Get msec from each, and subtract.
long diff = d2.getTime() - d1.getTime();
long diffSeconds = diff / 1000;         
long diffMinutes = diff / (60 * 1000);         
long diffHours = diff / (60 * 60 * 1000);                      
System.out.println("Time in seconds: " + diffSeconds + " seconds.");         
System.out.println("Time in minutes: " + diffMinutes + " minutes.");         
System.out.println("Time in hours: " + diffHours + " hours.");

My output is:

Time in seconds: 225 seconds.
Time in minutes: 3 minutes.
Time in hours: 0 hours.

But the correct output should be:

Time in seconds: 45 seconds.
Time in minutes: 3 minutes.
Time in hours: 0 hours.

Please help.

Answer 1

Hi… you can try using the below code to fix your program:

long diffSeconds = diff / 1000 % 60;  
long diffMinutes = diff / (60 * 1000) % 60;

Hope this helps!!

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Thank you

Answer 2

We can also use java.util.concurrent.TimeUnit class.

long diff = d2.getTime() - d1.getTime();//as given

long seconds = TimeUnit.MILLISECONDS.toSeconds(diff);
long minutes = TimeUnit.MILLISECONDS.toMinutes(diff);