time conversion routine

NTDEV
1

Does anybody know a C function to convert time from UTC format (e.g. that
obtained by Windows calls like GetSystemTimeAsFileTime()) to time_t in
Windows?

I don’t want to use MFC for this.

Regards,
Siddharth.

2

Look for gmtime(), mktime(), and localtime(). The MSDN Library contains
the descriptions.

3

> Does anybody know a C function to convert time from UTC format (e.g. that

obtained by Windows calls like GetSystemTimeAsFileTime()) to time_t in
Windows?

I don’t want to use MFC for this.

I convert C time to system time like this:

VOID CTimeToSystemTime(SYSTEMTIME &SystemTime, DWORD Value)
{
FILETIME FileTime;
ZeroStruct(SystemTime); // you can use own inline template function
SystemTime.wYear = 1970;
SystemTime.wDay = wMonth = 1;
SystemTimeToFileTime(&SystemTime, &FileTime);
((PLARGE_INTEGER)FileTime)->QuadPart += (LONGLONG)Value * 10000000;
FileTimeToLocalFileTime(&FileTime, &FileTime);
FileTimeToSystemTime(&FileTime, &SystemTime);
}

From here you can figure out how to make reverse conversion.

/regards/