static private Boolean CheckMessageValidityTime(Message msg){
		Calendar.getInstance();
		String currTime = Calendar.HOUR + ":" + Calendar.MINUTE;
		SimpleDateFormat sdf = new SimpleDateFormat("hh:mm");
		Date timeWithoutDate = new Date();

		try {
			timeWithoutDate = sdf.parse(currTime);
		} catch(Exception e) { }
		if(msg instanceof Periodic_Message){
			if(((Periodic_Message) msg).endDate.before(((Periodic_Message) msg).startDate))
				return false;
			if (((Periodic_Message) msg).endDate.before(new Date()))
				return false;
			if (((Periodic_Message) msg).startDate.before(new Date()))
				return false;
			if(((Periodic_Message) msg).endDate.equals(((Periodic_Message) msg).startDate)) {
				if(((Periodic_Message)msg).endHour < ((Periodic_Message)msg).startHour ||
				   (((Periodic_Message)msg).startHour < Calendar.HOUR_OF_DAY) && ((Periodic_Message) msg).endDate.equals(new Date()))
					return false;
			}

		}
		else {
			if(((Fixed_Time_Message) msg).date.after(new Date()))
				return false;
			if(((Fixed_Time_Message) msg).date.equals(new Date()) &&((Fixed_Time_Message)msg).time.after(timeWithoutDate))
				return false;
		}
		return true;
	}