时间差 参考

long longTimeStart = System.currentTimeMillis();
//do sth
long longTimePassed = System.currentTimeMillis() - longTimeStart;
long nd = 1000 * 60 * 60 * 24;
long nh = 1000 * 60 * 60;
long nm = 1000 * 60;
long ns = 1000;
long longSeconds = longTimePassed % nd % nh % nm / ns;

long longHours = longTimePassed / (60 * 60 * 1000);
long longMinutes = (longTimePassed - longHours * (60 * 60 * 1000)) / (60 * 1000);
long longSeconds = (longTimePassed - longHours * (60 * 60 * 1000) - longMinutes * (60 * 1000)) / 1000;