将UNIX纪元时间转换为SYSTEMTIME

Convert UNIX epoch time to SYSTEMTIME

本文关键字：SYSTEMTIME 转换 时间 UNIX 纪元      更新时间：2023-10-16

在我的c++ windows应用程序中，我正在将SYSTEMTIME转换为格式化字符串，如下所示:

    SYSTEMTIME systemTime;
    GetSystemTime(&systemTime);
    char pSystemTime[50];
    sprintf_s(pSystemTime, 50, "%04d%02d%02d%02d%02d%02d%03u", systemTime.wYear, systemTime.wMonth,
                                                                              systemTime.wDay, systemTime.wHour,
                                                                              systemTime.wMinute, systemTime.wSecond,
                                                                              systemTime.wMilliseconds);

现在我有了从UNIX纪元到现在的毫秒时间。

long time = 1442524186;  //for example

我如何将这个长epoch时间转换为SYSTEMTIME，以便我也可以将其格式化为字符串?

static UINT64 FileTimeToMillis(const FILETIME &ft)
{
    ULARGE_INTEGER uli;
    uli.LowPart = ft.dwLowDateTime; // could use memcpy here!
    uli.HighPart = ft.dwHighDateTime;
    return static_cast<UINT64>(uli.QuadPart/10000);
}
static void MillisToSystemTime(UINT64 millis, SYSTEMTIME *st)
{
    UINT64 multiplier = 10000;
    UINT64 t = multiplier * millis;
    ULARGE_INTEGER li;
    li.QuadPart = t;
    // NOTE, DON'T have to do this any longer because we're putting
    // in the 64bit UINT directly
    //li.LowPart = static_cast<DWORD>(t & 0xFFFFFFFF);
    //li.HighPart = static_cast<DWORD>(t >> 32);
    FILETIME ft;
    ft.dwLowDateTime = li.LowPart;
    ft.dwHighDateTime = li.HighPart;
    ::FileTimeToSystemTime(&ft, st);
}

来源:https://stackoverflow.com/a/11123106/2385309

编辑:也见:https://stackoverflow.com/a/26486180/2385309您可能需要为Epoch时间毫秒添加/减去11644473600000

在MillisToSystemTime中应该这样行:

UINT64 t = multiplier * millis + 116444736000000000
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