两个时间戳相差多长时间

好无聊……

public class DateUtil {
    public static String getDiff(long start,long end) {
        int ns = 1000;//一秒多少毫秒
        int nm = 60 * ns;//一分钟多少毫秒
        int nh = 60 * nm;//一小时多少毫秒
        int nd = 24 * nh;//一天多少毫秒
        long left = end - start;
        int d = (int) (left / nd);//天数
        left = left % nd;
        int h = (int) (left / nh);
        left = left % nh;
        int m = (int) (left / nm);
        left = left % nm;
        int s = (int) (left / ns);
        left = left % ns;
        return d+" d "+h+" h "+m+" m "+s+" s "+left+" ms ";
    }
}