private double calculateElapsedTime(String clockIn, String clockOut){
		SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	 
		try { 
			Date startDate = formatter.parse(clockIn);
			Date endDate = formatter.parse(clockOut);
			
			return endDate.getHours() - startDate.getHours() + ((endDate.getMinutes() - startDate.getMinutes()) / 60.00);
	 
		} catch (ParseException e) {
			e.printStackTrace();
		}
		
		return 0.00;
	}