Method getTimeDifference

src/thundersvm/util/log.cpp:1135–1146

            }

            unsigned long long DateTime::getTimeDifference(const struct timeval& endTime, const struct timeval& startTime,
                                                           base::TimestampUnit timestampUnit) {
                if (timestampUnit == base::TimestampUnit::Microsecond) {
                    return static_cast<unsigned long long>(static_cast<unsigned long long>(1000000 * endTime.tv_sec + endTime.tv_usec) -
                                                           static_cast<unsigned long long>(1000000 * startTime.tv_sec + startTime.tv_usec));
                }
                // milliseconds
                auto conv = [](const struct timeval& tim) {
                    return static_cast<unsigned long long>((tim.tv_sec * 1000) + (tim.tv_usec / 1000));
                };
                return static_cast<unsigned long long>(conv(endTime) - conv(startTime));
            }

            struct ::tm* DateTime::buildTimeInfo(struct timeval* currTime, struct ::tm* timeInfo) {
#if ELPP_OS_UNIX