获取n年前日期

    /**
     * 获取n年前日期
     * @param year 年数
     * @return
     */
    public static String getYearDate(int year){
        Calendar curr = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
        curr.set(Calendar.YEAR,curr.get(Calendar.YEAR)-year);
        return sdf.format( curr.getTime() );
    }

/**
     * 获取n天前日期
     * @param year 年数
     * @return
     */
    public String getYearDate(int day,String format){
		Calendar cal = Calendar.getInstance();
		cal.add(Calendar.DATE,  day );
		return new SimpleDateFormat( format ).format(cal.getTime());
    }