comparing current date and time with got date and time .

OK, can't help you further as I now realize that this is for Android.

Did you follow my suggestion about the breakpoint?

public void onClick(View v)
    {
        //Date picker
        if (v == setdate)
        {

            // Process to get Current Date
            final Calendar c = Calendar.getInstance();
            mYear = c.get(Calendar.YEAR);
            mMonth = c.get(Calendar.MONTH);
            mDay = c.get(Calendar.DAY_OF_MONTH);

            // Launch Date Picker Dialog
            dpd = new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener()
            {

                @Override
                public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth)
                {
                    // Display Selected date in textbox
                    setdate.setText(dayOfMonth + "-" + (monthOfYear + 1) + "-" + year);

                }
            }, mYear, mMonth, mDay);
            dpd.show();
        }
        if (v == settime)
        {

            // Process to get Current Time
            final Calendar c = Calendar.getInstance();
            mHour = c.get(Calendar.HOUR_OF_DAY);
            mMinute = c.get(Calendar.MINUTE);

            // Launch Time Picker Dialog
            TimePickerDialog tpd = new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener()
            {

                @Override
                public void onTimeSet(TimePicker view, int hourOfDay, int minute)
                {
                    // Display Selected time in textbox
                    settime.setText(hourOfDay + ":" + minute);
                }
            }, mHour, mMinute, false);
            tpd.show();
        }
        if (v == save_contacts)
        {
            final String name1 = name.getText().toString();
            final String mobile_number1 = mobile_number.getText().toString();
            final String home_number1 = home_number.getText().toString();
            final String company_name1 = company_name.getText().toString();
            final String jobtitle1 = jobtitle.getText().toString();
            final String emailid1 = emailid.getText().toString();
            SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy");
            // SimpleDateFormat formatterDate = new SimpleDateFormat("dd/MM/yyyy");
            SimpleDateFormat formatterTime = new SimpleDateFormat("HH:mm");
            String dateInString = setdate.getText().toString();
            String timeInString = settime.getText().toString();
            Date date = null;
            Date time = null;
            Date todayDate;
            try
            {
                date = formatter.parse(dateInString);
                time = (Date) formatterTime.parse(timeInString);
            ////    current_date=formatter.parse()
                //Calendar current = Calendar.getInstance();
            //
                todayDate = formatter.parse(formatter.format(new Date() ));
                /*Calendar cal = Calendar.getInstance();
               
                cal.set(date.getYear()+1900, date.getMonth(), date.getDay(),time.getHours(), time.getMinutes());
            */
           
                if (date.compareTo(todayDate) <= 0)
                {
                    // setAlarm(cal);
                    // The set Date/Time already passed
                //    setAlarm(cal);
                    Toast.makeText(getApplicationContext(), "Invalid Date/Time", Toast.LENGTH_LONG).show();
                }
                else
                {
                    // setAlarm(cal);
                     db.addContact(new Contact_details(name1, mobile_number1, home_number1, company_name1, jobtitle1, emailid1, date, time));
                     Toast.makeText(getApplicationContext(), "" + date + "" + time, Toast.LENGTH_LONG).show();
                }

            }
            catch (java.text.ParseException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
           
           

           
           
        }
           
    }
this is full code and i will get date and time using pickers and i need to compare with current date and time

This is a little bit of a guess based on the fact that there is a getInstance() call.

'current' and 'cal' will follow each other; if 'current' changes, 'cal' changes and if 'cal' changes, 'current' changes.

I suggest that you put a breakpoint on if(cal.CompareTo(current) <=0) and and check cal and current. If I'm right, they will still be the same after you changed cal.

Below a simple example (I could not find a Calendar control so this is a bit of a guess how to get the info out of the Calendar control)

  DateTime current = new DateTime(current.year, current.month, current.day);
  DateTime cal = new DateTime(date.getYear(), date.getMonth(), date.getDay());

  if (cal <= current)
  {
  }

This only takes date into account, not time. You can add the rest.