if(date.before(new Date())) { ... }
(а так же было ли уже отправлено уведомление)AlarmManager manager = (AlarmManager)getSystemService(
Context.ALARM_SERVICE);
Intent intent = new Intent(getApplicationContext(), ServiceMeeting1.class);
PendingIntent alarmIntent = PendingIntent.getService(getApplicationContext(), 0, intent, 0);
manager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,
SystemClock.elapsedRealtime() +
60 * 1000, alarmIntent);