Why My App is crazy with 1 Jan 1970

[rahul.kulshreshtha]

Hello I am using the following code to find the seconds passed since 1 Feb 1970
It is working fine with 1 Feb. If I try to do it for 1 Jan then I get a big 0 in output. Why is it so ?? What to do ?? Currently I am manually adding 2678400 seconds to what I get from 1 Feb.


#include <time.h>
#include <ctime>
#include <iostream>

using namespace std;

double dateDifferenceInSeconds(std::time_t date1, std::time_t date2)
{
if ( date1 != (std::time_t)(-1) && date2 != (std::time_t)(-1) )
{
return std::difftime(date2, date1) ;/// (60 * 60 * 24);
}
return NULL;
}


int main()
{
struct std::tm a = {0,0,0,2,0,70}; /* Feb 1, 1970 */

time_t currentTime;
time ( &currentTime );
time_t x = mktime(&a);


double timeInSeconds = dateDifferenceInSeconds(x, currentTime);
printf("\n%.0lf\n",timeInSeconds + 2678400); // Adding seconds of 1 month

return 0;
}


If I use {0,0,0,1,0,70} in place of {0,0,0,2,0,70} for starting it from 1 jan then I get 0 as output

[srinathduraisamy]

What ever time function returns itself is number of seconds elapsed from 1 st jan 1970.
Why do you want to calculate it separately?

[rahul.kulshreshtha]

Actually I was making a function that will give the difference between two dates/time
It was working fine with all but when I tested with 1970; it didn't worked.

Instead of time function you can assume another date in that structure like {0,0,0,1,0,100} for 1 Jan 2000. Forget about time function; tell me for difftime