public static TreeMap<String, Integer> getTimeZone(ArrayList<Kill> kills) {
		TreeMap<String, Integer> output = new TreeMap<String, Integer>(); // the output
		
		int hour;
		for (Kill k : kills) {
			hour = k.getKillTime().get(Calendar.HOUR_OF_DAY);
			
			if(!output.containsKey(String.valueOf(hour)+"h")){
				output.put(String.valueOf(hour)+"h", 1);
			} else {
				output.put(String.valueOf(hour)+"h", output.get(String.valueOf(hour)+"h") + 1);
			}
		}

		return output;
	}