Subtracting Time Problem

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I'm trying to figure out how to subtract 20 seconds from this time, as well as the placement. I am deleteing files that are 20 seconds or less. Thank you. Help is apprecitiated!

C++

using namespace std; 
typedef vector tFoundFilesVector; 
std::wstring LastWriteTime;   
//int getFileList(wstring filespec, tFoundFilesVector &foundFiles) //uni
int getFileList(const char * filespec, tFoundFilesVector &foundFiles) //ansi
{ 
    WIN32_FIND_DATA findData; 
    HANDLE h; 
    int validResult=true; 
 
    int numFoundFiles = 0; 
    //h = FindFirstFile(filespec.c_str(), &findData); //uni 
	h = FindFirstFile((LPCSTR)filespec, &findData); //ansi 
    if (h == INVALID_HANDLE_VALUE) 
        return 0; 
 
    while (validResult) 
    { 
        numFoundFiles++; 
        foundFiles.push_back(findData); 
        validResult = FindNextFile(h, &findData); 
    } 
    return numFoundFiles; 
} 
 
void showFileAge(tFoundFilesVector &fileList) 
{ 
    unsigned _int64 fileTime, curTime, age; 
    tFoundFilesVector::iterator iter; 
    FILETIME ftNow; 
    CoFileTimeNow(&ftNow); 
          curTime = ((_int64) ftNow.dwHighDateTime << 32) + ftNow.dwLowDateTime; 
 
          for (iter=fileList.begin(); iterftLastWriteTime.dwHighDateTime << 32) + iter->ftLastWriteTime.dwLowDateTime; 
 
        age = curTime - fileTime;
		if (age <= (_int64)age/10000000UL-20)
		{
			remove("*.*");
		}
		else
		{
			return;
		}

 
        wcout << "FILE: '" << iter->cFileName << "', AGE: " << (_int64)age/10000000UL << "  seconds" << endl; 
    } 
} 
 
int main() 
{ 
    string fileSpec = "*.*"; 
    tFoundFilesVector foundFiles; 
    tFoundFilesVector::iterator iter; 
 
    int foundCount = 0; 
 
    getFileList("c:\\Mapper\\*.txt", foundFiles); 
    getFileList("c:\\Mapper\\*.jpg", foundFiles);
	     foundCount = foundFiles.size(); 
    if (foundCount) 
    { 
        wcout << "Found "<</pre>

Posted 2-Oct-11 15:19pm

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Mohibur Rashid · Accepted Answer · 2011-10-02T18:58:00

In general I use this function,

C++

char *DateDiffer(char *Date, int DayToSub)
{
	struct tm time,*tmt;
	time_t mtime;
	int year,month,date;
	char *buffer;
	buffer=(char *)malloc(sizeof(char)*10);
	if(Date!=NULL)
	{
		sscanf(Date,"%d-%d-%d",&year,&month,&date);
	}	

	memset((char*)(&time),0,sizeof(struct tm));
	time.tm_year=year-1900;
	time.tm_mon=month-1;
	time.tm_mday=date-DayToSub;
	mtime=mktime(&time);
	tmt=localtime(&mtime);
	sprintf(buffer,"%04d-%02d-%02d\n",(tmt->tm_year+1900),(tmt->tm_mon+1),tmt->tm_mday);
	return buffer;
}