src/org/nutz/lang/Times.java
public static String secs(int sec) {
        int hh = sec / 3600;
        sec -= hh * 3600;
        int mm = sec / 60;
        sec -= mm * 60;
        return Strings.alignRight(hh, 2, '0')
               + ":"
               + Strings.alignRight(mm, 2, '0')
               + ":"
               + Strings.alignRight(sec, 2, '0');

    }
public static String secs(int sec) {
        int hh = sec / 3600;
        sec -= hh * 3600;
        int mm = sec / 60;
        sec -= mm * 60;
        return Strings.alignRight(hh, 2, '0')
               + ":"
               + Strings.alignRight(mm, 2, '0')
               + ":"
               + Strings.alignRight(sec, 2, '0');

    }
根据一个当天的绝对秒数，得到一个时间字符串，格式为 "HH:mm:ss"

@param sec
当天的绝对秒数
@return 时间字符串