UTC时间戳
QDateTime time ;
time = QDateTime::fromString(strBuffer, "yyyyMMddhhmmsszzz");
time.setTimeSpec(Qt::UTC);
long long seconds2 = time.toMSecsSinceEpoch(); // 13位时间戳
int nTimeStap = time.toTime_t();//10位时间戳
本地时间戳：
QDateTime time ;
time = QDateTime::fromString(strBuffer, "yyyyMMddhhmmsszzz");
//time.setTimeSpec(Qt::LocalTime);
long long seconds2 = time.toMSecsSinceEpoch(); // 13位时间戳
int nTimeStap = time.toTime_t();//10位时间戳