I love programming

Thanks my programming . I solve this problem. Now I can calculate the time difference .

I want to remember this code. I am really really excited now.

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button1 = (Button) findViewById(R.id.setalarm);
tp = (TimePicker) findViewById(R.id.tp);

// button click to get time from time-picker
button1.setOnClickListener(new View.OnClickListener() {
    @Override    public void onClick(View view) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(
                calendar.get(Calendar.YEAR),
                calendar.get(Calendar.MONTH),
                calendar.get(Calendar.DAY_OF_MONTH),
                tp.getHour(),
                tp.getMinute(),
                0
        );



        Intent intent = new Intent(MainActivity.this, Notification_receiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 100, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        // this time is for reminder--- 

       long value = calendar.getTimeInMillis();
        System.out.println(value);

        // to get present time--- 

        java.util.Calendar time = java.util.Calendar.getInstance();
        long present_time = time.getTimeInMillis();
        System.out.println(present_time);


        long difference = value - present_time;
        System.out.println(difference);

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