time comarision

If you want to calculate only time between two times **in same day** which are formatted as "HH:MM:SS" then it is pretty much easy

Use simple HttpDateParser and take any date which have proper format

like "Tue, 27 Mar 2012 09:11:37 GMT"

here we replace only time then you will get time in millies between two times

 

    String common="Tue, 27 Mar 2012 "; //09:11:37 GMT
                   String time1="1:50:10";
                   String time2="3:30:20";
                 long startTime = HttpDateParser.parse(common+time1+" GMT");
                 System.out.println("start time is :" + startTime);
                 long endTime =  HttpDateParser.parse(common+time2+" GMT");
                 System.out.println("end time is :" + endTime);
                 long diff = endTime - startTime;
               
                 SimpleDateFormat formate=new SimpleDateFormat("HH:mm:ss");
                 String formateddate=formate.formatLocal(diff);
                 System.out.println("Difference in Houres:"+formateddate);


I got output as

    [0.0] start time is :1332813010000
    [0.0] end time is :1332819020000
    [0.0] Difference in Houres:01:40:10


**Note : If you want to calculate between two different days
Here you need to pass date format should be proper like example: "YYYY-mm-dd hh:mm:ss"**

here i provide some sample example



    import java.util.Calendar;
   
    import net.rim.device.api.i18n.SimpleDateFormat;
    import net.rim.device.api.io.http.HttpDateParser;
    import net.rim.device.api.ui.Field;
    import net.rim.device.api.ui.FieldChangeListener;
    import net.rim.device.api.ui.component.ButtonField;
    import net.rim.device.api.ui.component.LabelField;
    import net.rim.device.api.ui.container.MainScreen;
    import net.rim.device.api.ui.picker.DateTimePicker;
   
    public final class Screen1 extends MainScreen implements FieldChangeListener
    {
        /**
         * Creates a new MyScreen object
         */
        ButtonField date1;
        ButtonField date2;
        ButtonField button;
        LabelField lbl;
        DateTimePicker picker;
        String str="";
        Calendar cal;   
       
        public Screen1()
        {  
           
            date1=new ButtonField("date1");
            date1.setChangeListener(this);
            add(date1);
           
            date2=new ButtonField("date2");
            date2.setChangeListener(this);
            add(date2);
           
            button = new ButtonField("Screen 1 ");
            button.setChangeListener(this);
            add(button);
            lbl=new LabelField();
            add(lbl);
        }
        public void fieldChanged(Field field, int context) {
            if(field==button){//Tue, 27 Mar 2012 09:11:37 GMT
          
                   System.out.println(date1.getLabel().toString()+"   "+date2.getLabel().toString());
                 long startTime = HttpDateParser.parse(date1.getLabel().toString());
                 System.out.println("start time is :" + startTime);
                 long endTime =  HttpDateParser.parse(date2.getLabel().toString());
                 System.out.println("end time is :" + endTime);
                 long diff = endTime - startTime;
          
                 SimpleDateFormat formate=new SimpleDateFormat("HH:mm:ss");
                 String formateddate=formate.formatLocal(diff);
                 System.out.println("Difference in Houres:"+formateddate);
                 lbl.setText("Time Between above dates is :"+formateddate);
            }else if(field==date1)
            {
                date1.setLabel(getDateTimeFromPicker().toString());                                   
           
            }else if(field==date2)
            {
                date2.setLabel(getDateTimeFromPicker().toString());
            }
   
        }
        private String getDateTimeFromPicker()
        {
            picker = DateTimePicker.createInstance( Calendar.getInstance(), "yyyy-MM-dd", "HH:mm:ss");
            picker.doModal();
            cal=picker.getDateTime();
            str="";
            if((cal.get(Calendar.MONTH)+1)<10)
                str=str+cal.get(Calendar.YEAR)+"-"+"0"+(cal.get(Calendar.MONTH)+1);
            else
                str=str+cal.get(Calendar.YEAR)+"-"+(cal.get(Calendar.MONTH)+1);
           
            if(cal.get(Calendar.DATE)<10)
                str=str+"-"+"0"+cal.get(Calendar.DATE);
            else
                str=str+"-"+cal.get(Calendar.DATE);
           
            if(cal.get(Calendar.HOUR_OF_DAY)<10)
                str=str+" "+"0"+cal.get(Calendar.HOUR_OF_DAY);
            else
                str=str+" "+cal.get(Calendar.HOUR_OF_DAY);
           
            if(cal.get(Calendar.MINUTE)<10)
                str=str+":"+"0"+cal.get(Calendar.MINUTE);
            else
                str=str+":"+cal.get(Calendar.MINUTE);
           
            if(cal.get(Calendar.SECOND)<10)
                str=str+":"+"0"+cal.get(Calendar.SECOND);
            else
                str=str+":"+cal.get(Calendar.SECOND);
            return str;
        }
    }

you can see as following output in your screen
![enter image description here][1]


  [1]: http://i.stack.imgur.com/4Rggl.png