title: cancel a particular alarm
body: <p>I am setting alarms at diffrent time . I want to delete a particulat alarm.
  Ex. I set 100 alarms at diiferents times , now I want to Delete an alarm set at 25 Feb 2012 10.45 AM. How Can I do that.</p>
  
  <p>I written following code to set alarm.</p>
  
  <pre><code>       final AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
         GregorianCalendar  gc=new GregorianCalendar();
         gc.set(2012, 1, 22, 10, 42,0);
  
         Intent intent = new Intent(this, AlarmService.class);
         gc.set(Calendar.AM_PM,0);
  
         final PendingIntent sender = PendingIntent.getBroadcast(this, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT);
  
         am.set(AlarmManager.RTC_WAKEUP, gc.getTimeInMillis(), sender);
  </code></pre>
  
  <p>I have a broadcast receiver to recieve the alarm.</p>