Looking for DateDiff Equivalent. Must make app time limited trial..

Since you are on Windows, the Windows API should also be mentioned. The functions presented in the article at http://www.codeproject.com/datetime/winapi_datetime_ops.asp ("WinAPI - simple operations with datetime") e.g have something similar to 'DateDiff', e.g.

 SYSTEMTIME s1={2003,11,0,28,12/*hours*/,0,0,0},s2={2003,12,0,1,0,0,0,0};
 printf("%f\n",DT_PeriodsBetween(nano100SecInDay,&s1,&s2));

would retrieve the days elapsed between both time stamps.

For more general information, see http://www.codeproject.com/datetime/datetimedisc.asp ("Date and Time in C++")

Back to difftime. How could I structure a date in the format 2/13/2006 to a time_t and then do the datediff..

Use mktime() to convert struct tm to time_t

Could you explain why this doesnt work?


#define TIME_LIMIT ((double)86400 * 30)
struct tm  timeinfo;


//'memset(&stm,0,sizeof(stm));

timeinfo.tm_year = 2006 - 1900; // subtract 1900
timeinfo.tm_mon = 2 - 1; // January == 0
timeinfo.tm_mday = 10;

//long * crap =1139813215;
time_t start_time = mktime(&timeinfo);
// Some time later...
time_t curr_time =  time(NULL);

// Calculate the time difference (in seconds)
double crap = difftime(curr_time, start_time);
if (crap > TIME_LIMIT) {
    printf("%d > %d\n",difftime, TIME_LIMIT);
return 0;
}



      printf("%d Huh %d\n",start_time, curr_time);
      return 0;

>>Could you explain why this doesnt work?

Your format strings are a bit off, that should be

    printf("%ud > %ud\n",crap, TIME_LIMIT);
    printf("%ud Huh %ud\n",start_time, curr_time);

Thanks I used an INI class and the following code

int main(int argc, char* argv[])
{
#define TIME_LIMIT ((double)86400 * 30)
time_t curr_time =  time(NULL);
CIniReader iniReader("MintDNS.ini");
CIniWriter iniWriter("MintDNS.ini");
time_t start_time;
int gettm = iniReader.ReadInteger("Encoding", "Style", 25);
 start_time = gettm;
    if (gettm == 777){
         start_time =  curr_time;
      }
if (gettm == 111){
        start_time = time(NULL);
        iniWriter.WriteInteger("Encoding", "Style", (DWORD)start_time);
        start_time = iniReader.ReadInteger("Encoding", "Style", 25);
      }

double crap = difftime(curr_time, start_time);
if (crap > TIME_LIMIT) {
    printf("Expired\n");
return 0;
}



      printf("%d seconds past\n",crap);
      return 0;
}