Calculate Difference Between Two Times in Android

Calculate Difference between two times in Android

Try below code.

// suppose time format is into ("hh:mm a") format

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("hh:mm a");

date1 = simpleDateFormat.parse("08:00 AM");
date2 = simpleDateFormat.parse("04:00 PM");

long difference = date2.getTime() - date1.getTime(); 
days = (int) (difference / (1000*60*60*24));  
hours = (int) ((difference - (1000*60*60*24*days)) / (1000*60*60)); 
min = (int) (difference - (1000*60*60*24*days) - (1000*60*60*hours)) / (1000*60);
hours = (hours < 0 ? -hours : hours);
Log.i("======= Hours"," :: "+hours);

Output - Hours :: 8

Time difference between two times

To Calculate the difference between two dates you could try something like:

long millis = date1.getTime() - date2.getTime();
int hours = (int) (millis / (1000 * 60 * 60));
int mins = (int) ((millis / (1000 * 60)) % 60);

String diff = hours + ":" + mins; 

To update the Time Difference every second you can make use of Timer.

Timer updateTimer = new Timer();
updateTimer.schedule(new TimerTask() {
    public void run() {
        try {
            long mills = date1.getTime() - date2.getTime();
                int hours = millis/(1000 * 60 * 60);
                 int mins = (mills/(1000*60)) % 60;

                 String diff = hours + ":" + mins; // updated value every1 second
            } catch (Exception e) {
            e.printStackTrace();
        }
    }

}, 0, 1000); // here 1000 means 1000 mills i.e. 1 second

Edit : Working Code :

public class MainActivity extends Activity {

    private TextView txtCurrentTime;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        txtCurrentTime= (TextView)findViewById(R.id.mytext);
        Timer updateTimer = new Timer();
        updateTimer.schedule(new TimerTask() 
        {
            public void run() 
            {
                try 
                {
                    
                    SimpleDateFormat format = new SimpleDateFormat("hh:mm:ss aa");
                    Date date1 = format.parse("08:00:12 pm");
                    Date date2 = format.parse("05:30:12 pm");
                    long mills = date1.getTime() - date2.getTime();
                    Log.v("Data1", ""+date1.getTime());
                    Log.v("Data2", ""+date2.getTime());
                    int hours = (int) (mills/(1000 * 60 * 60));
                    int mins = (int) (mills/(1000*60)) % 60;

                    String diff = hours + ":" + mins; // updated value every1 second
                    txtCurrentTime.setText(diff);
                } 
                catch (Exception e) 
                {
                    e.printStackTrace();
                }
            }

        }, 0, 1000);
    }

Difference between two times in Android Studio, (Registered time and current time)

This answer lead me the right way, actually my approach was good I just needed to make a function that showed only the difference.

I made this one. Hope it helps somebody.

Just call the function with the result of you operation, at the end I used Date().getTime() instead of System.currentTimeMillis() but I think it should be the same.

The complete code:

startTime = System.currentTimeMillis().toDouble()

timer = Timer()
timer.schedule(timerTask {
    runOnUiThread {
        advanceTimer()
    }
}, 0, 60)

fun advanceTimer() {
//Total time since timer started, in seconds
val currentTime = System.currentTimeMillis().toDouble()
time = currentTime-startTime

// Shows the time in a label on the screen
timerString.text = differenceResult(time)
}

fun differenceResult(time: Long): String {
    var x: Long = time / 1000

    var seconds = x % 60
    x /= 60
    var minutes = x % 60
    x /= 60
    var hours = (x % 24).toInt()
    x /= 24
    var days = x
    return String.format("%02d:%02d:%02d", hours, minutes, seconds)
}

How to calculate difference between two times in Java?

You could take two dates/times and minus them from each other to get a duration.
This duration can then be converted into whatever format you need.

The example is an example, your mileage may vary.

LocalDateTime fromDateTime = LocalDateTime.of(2019, 10, 07, 7, 45, 55);
LocalDateTime current = LocalDateTime.now();    
long duration = current.toEpochSecond(ZoneOffset.UTC) - fromDateTime.toEpochSecond(ZoneOffset.UTC);
double minutes = duration/60.0;
double hours = duration/3600.0;
System.out.println("Minutes: "+ minutes);
System.out.println("Hours: "+ hours);

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