c/c++ 获取系统时间毫秒级

原创已于 2022-08-30 13:08:08 修改

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#c++ #c语言 #开发语言

于 2022-08-22 11:48:36 首次发布

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#include <sys/time.h>
#include <time.h>
#include <string>
#include <stdio.h>
std::string GetTimeInMill()
{
    struct timeval tTimeVal;
    gettimeofday(&tTimeVal, nullptr);
    struct tm *tTM = localtime(&tTimeVal.tv_sec);
    char timeStr[512]{0};
    sprintf(timeStr, "%04d-%02d-%02d %02d:%02d:%02d.%03ld",
            tTM->tm_year + 1900, tTM->tm_mon + 1, tTM->tm_mday,
            tTM->tm_hour, tTM->tm_min, tTM->tm_sec,
            tTimeVal.tv_usec / 1000);
    return std::string(timeStr);
}

std::string Mill2DateStr(const uint64_t mill)
{
#if 0
    time_t tt = std::chrono::system_clock::to_time_t(std::chrono::time_point<std::chrono::system_clock, std::chrono::milliseconds>(std::chrono::milliseconds(mill)));
    auto *tTM = gmtime(&tt);
#else
    time_t sec = mill / 1000;
    auto *tTM = localtime(&sec);
#endif
    auto millLeft = mill % 1000;
    char timeStr[512]{0};
    sprintf(timeStr, "%04d-%02d-%02d %02d:%02d:%02d.%03ld",
            tTM->tm_year + 1900, tTM->tm_mon + 1, tTM->tm_mday,
            tTM->tm_hour, tTM->tm_min, tTM->tm_sec,
            millLeft);
    return std::string(timeStr);
}