QDateTime time = QDateTime::fromTime_t(unsigned int seconds); //时间戳非毫秒级
QDateTime time = QDateTime::fromMSecsSinceEpoch(long long int msecs); //时间戳-毫秒级
QString strStartTime = time.toString("yyyy-mm-dd hh:mm:ss");
startTimeSec = strStartTime.toLongLong();