Converting FILETIME to timestamp

This is a discussion on Converting FILETIME to timestamp within the Windows Programming forums, part of the Platform Specific Boards category; I would like to convert my FILETIME structure to timestamp. Is there an easy way to do it? (The FILETIME ...

  1. #1
    Reverse Engineer maxorator's Avatar
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    Converting FILETIME to timestamp

    I would like to convert my FILETIME structure to timestamp. Is there an easy way to do it?
    (The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601.)

    Actually I want to compare it to the current time and see if 29 days have passed since the file was last modified/created/accessed.
    "The Internet treats censorship as damage and routes around it." - John Gilmore

  2. #2
    Registered User kryptkat's Avatar
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    FileTimeToSystemTime() ?

  3. #3
    Reverse Engineer maxorator's Avatar
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    But how do I convert the system time to timestamp? (Timestamp means seconds from 1. january 1970, it's used in many places)
    "The Internet treats censorship as damage and routes around it." - John Gilmore

  4. #4
    and the hat of wrongness Salem's Avatar
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    > and see if 29 days have passed since the file was last modified/created/accessed.
    So why the need to rebase to seconds since 1/1/1970

    Just work out how many 100nS there are in 29 days (that's easy) and use the timestamp you have.
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    How about using Julian dates?

    Code:
    #include <windows.h>
    #include <stdio.h>
    
    LONG CalcDays(int iYear, int iMonth, int iDay)
    {
        LONG lReturnDays = iDay;
        int iTemp1 = (14 - iMonth) / 12;
        int iTemp2 = iYear + 4800 - iTemp1;
        int iTemp3 = iMonth + 12 * iTemp1 - 3;
    
        lReturnDays += (153 * iTemp3 + 2)/5;
        lReturnDays += 365 * iTemp2 + iTemp2 / 4 - 32083;
        return lReturnDays;
    }
    
    BOOL CalcFileAge(char * szFile)
    {
        LONG lFileDays, lCurrentDays;
        FILETIME ftCreate, ftAccess, ftWrite, ftLocal;
        SYSTEMTIME stCreate, stNow;
        HANDLE hFile; 
    
        hFile = CreateFile(szFile,           
            GENERIC_READ,             
            FILE_SHARE_READ,           
            NULL,                     
            OPEN_EXISTING,             
            FILE_ATTRIBUTE_NORMAL,     
            NULL);                     
        if (hFile == INVALID_HANDLE_VALUE) 
            return FALSE;   
        if (!GetFileTime(hFile, &ftCreate, &ftAccess, &ftWrite))
        {
            CloseHandle(hFile);
            return FALSE;
        }
        if (!FileTimeToLocalFileTime(&ftWrite, &ftLocal))
        {
            CloseHandle(hFile);
            return FALSE;
        }
        GetSystemTime(&stNow);
        FileTimeToSystemTime(&ftLocal, &stCreate);
        CloseHandle(hFile);
        lFileDays = CalcDays(stCreate.wYear,stCreate.wMonth,stCreate.wDay);
        lCurrentDays = CalcDays(stNow.wYear,stNow.wMonth,stNow.wDay);
        printf("%s is %ld day(s) old\n", szFile, (lCurrentDays - lFileDays));
        return TRUE;
    }
    
    int main(int argc, char **argv)
    {
        CalcFileAge(argv[1]);
        return 0;
    }

  6. #6
    Reverse Engineer maxorator's Avatar
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    I already did it as Salem said...
    "The Internet treats censorship as damage and routes around it." - John Gilmore

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