src/org/nutz/lang/Times.java
public static String nextDay(int day) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(now());
        cal.add(Calendar.DAY_OF_YEAR, day);
        return format(DF_DATE, cal.getTime());
    }
public static String nextDay(int day) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(now());
        cal.add(Calendar.DAY_OF_YEAR, day);
        return format(DF_DATE, cal.getTime());
    }
取得距离今天 day 日的日期

@param day
天数
@return 日期字符串