How to Convert Filetime to Datetime in C++ (MFC/Win32) - datetime

Question

I am trying to get Windows boot up time using WMI query and got it as CIM_DATETIME format.
I converted it into File time .The value I get form it is 132372033265000000.
I need to convert it in to Date time(Sunday, June 21, 2020 8:55:27am).
I found many solutions in C# but couldn't able to find one in C++.

Answer 1

Here is a solution that takes the current locale into account. I takes a SYSTEMTIME but you can easily convert that from a FILETIME:
CString DateTimeStr(const SYSTEMTIME *pST, bool bSeconds, bool bDate, bool bTime, bool bLongDate, bool bMilliSec, LCID Locale)
{
CString sDate, sTime;
DWORD dwFlags;
int iStrLen;
LPTSTR pBuf;
if (bDate)
{
dwFlags = 0;
if (bLongDate)
dwFlags |= DATE_LONGDATE;
else
dwFlags |= DATE_SHORTDATE;
iStrLen = GetDateFormat(Locale, dwFlags, pST, NULL, NULL, 0);
pBuf = sDate.GetBuffer(iStrLen + 2);
(void)GetDateFormat(Locale, dwFlags, pST, NULL, pBuf, iStrLen+2);
sDate.ReleaseBuffer();
}
if (bTime)
{
dwFlags = 0;
if (!bSeconds)
dwFlags |= TIME_NOSECONDS;
iStrLen = GetTimeFormat(Locale, dwFlags, pST, NULL, NULL, 0);
pBuf = sTime.GetBuffer(iStrLen + 2);
(void)GetTimeFormat(Locale, dwFlags, pST, NULL, pBuf, iStrLen+2);
sTime.ReleaseBuffer();
if (bMilliSec)
sTime += _T(" ") + FmtNum(pST->wMilliseconds, 3, true) + TEXT(" ms");
}
if (bDate && bTime)
return sDate + _T(" ") + sTime;
if (bDate)
return sDate;
if (bTime)
return sTime;
return (_T(""));
}

Answer 2

To convert a FILETIME structure into a time that is easy to
display to a user, use the FileTimeToSystemTime function.
Code Sample:
#include <Windows.h>
#include <iostream>
int main()
{
const char *day[] = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
const char* month[] = {"January","February","March","April","May","June","July", "August","September","October","November","December"};
long long value = 132372033265000000;
FILETIME ft = { 0 };
ft.dwHighDateTime = (value & 0xffffffff00000000) >> 32;
ft.dwLowDateTime = value & 0xffffffff;
SYSTEMTIME sys = { 0 };
FileTimeToSystemTime(&ft, &sys);
std::cout << day[sys.wDayOfWeek] << "," << month[sys.wMonth] << " " << sys.wDay << "," << sys.wYear << " "<< sys.wHour << ":" << sys.wMinute << ":" << sys.wSecond;
return 0;
}
Output:
Sunday,July 21,2020 8:55:26