import java.text.SimpleDateFormat;
import java.util.Calendar;

public class Main {

    public static void main(String[] args) {
        try{
            String month = acquireMonth(1);
            System.out.println(month);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    public static String acquireMonth(Integer month) throws Exception{
        SimpleDateFormat monthSdf = new SimpleDateFormat("yyyy-MM");
        SimpleDateFormat dateSdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.MONTH,month);
        System.out.println(dateSdf.format(calendar.getTime()));
        return monthSdf.format(calendar.getTime());
    }
}