获取微妙毫秒级时间和时间戳

原创已于 2023-04-03 10:35:03 修改 · 3.1k 阅读

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#qt #开发语言 #c++

于 2022-12-13 11:05:05 首次发布

毫秒级：

QDateTime dateTime = QDateTime::currentDateTime();
QString strTime = dateTime.toString(“yyyy-MM-dd hh:mm:ss”);
qint64 timestamp= dateTime.toMSecsSinceEpoch();
QString strTimestamp = QString::number(timestamp); //13位时间戳

微秒级

QDateTime dateTime = QDateTime::currentDateTime();
QString strTime = dateTime.toString(“yyyy-MM-dd hh:mm:ss.zzz”);
struct timeval timestamp;
gettimeofday(&timestamp);
QString strTimestamp = QString::number(timestamp.tv_sec)+QString::number(timestamp.tv_usec);
qint64 uTimestamp = tstamp.toLong(); //16位时间戳

windows需要定义函数，linux只需添加头文件<sys/time.h>

#include <winsock.h>
#include <minwindef.h>
#include <sysinfoapi.h>
void gettimeofday(struct timeval *tv)
{
    if (tv != nullptr)
	{
		const unsigned __int64 delta_ = 11644473600000000Ui64;
		const double secOffSet = 0.000001;
		const unsigned long usecOffSet = 1000000;
		FILETIME fileTime;
		GetSystemTimeAsFileTime(&fileTime);
		unsigned __int64 present = 0;
		present |= fileTime.dwHighDateTime;
		present = present << 32;
		present |= fileTime.dwLowDateTime;
		present /= 10; // mic-sec
		// Subtract the difference
		present -= delta_;
		tv->tv_sec = static_cast<long>(present * secOffSet);
		tv->tv_usec = static_cast<long>(present % usecOffSet);
	}
}