filetime systemtime and duration

[Georgia]

Hello,

I need the day-duration from a file. How long exists the file in days. I get the filetime I can convert it into a systemtime. But I need the duration in days. I don't like to calculate it alone. Now my question. Does any function exist how I can resolve this problem?

[antony holmes]

Hello,

If you have the the file time as either a SYSTEMTIME or a FILETIME you can use the following code


CTimeSpan ts = CTime::GetCurrentTime() - file_time;
int days=ts.GetDays() ;




Regards

Tony

[Georgia]

Thanks a lot.

If you know another class as the CTimeSpan it would be helpfully. Because I can't use MFC. Exist a WIN API function?

[antony holmes]

Hello

OK, try this. You need to start with a FILETIME.


SYSTEMTIME systime ;
FILETIME now ;
GetSystemTime(&systime) ;
SystemTimeToFileTime(&systime, &now) ;

LONGLONG interval=((LARGE_INTEGER *)&now)->QuadPart - ((LARGE_INTEGER *)&file_time)->QuadPart;
interval/=10000000 ; // file time is 100-nanosecond intervals

int days=(int)(interval/(24*3600)) ;




Regards

Tony

[solex]

#include "stats.h"
// if you have the 2 FILETIMES we can do
__int64 iFile = INT64_FROM_FILETIME(file);
__int64 iToday = INT64_FROM_FILETIME(today);
__int64 iDiff = iToday - iFile;
// That tells us how many times 100 nanosecs there are
long lDays = iDiff / 864000000000; //100 nanosecs in a day