Date calculation program

Hi there,

The programe below outputs the difference between two dates, i want to edit it so the 1st date is always today's date. Would i need to use the time function or rawtime. I am struggling to integrate it into the format of this programme. Could anyone point me in the right direction?

Code:

#include <stdio.h> //

#include <time.h> // Include C time functions in header

int daysto(struct tm *before, struct tm *after) // Grouping code for daysto calculation

{

time_t first = mktime(before), second = mktime(after); // Declaring time_t

if ( first != (time_t)-1 && second != (time_t)-1 ) // If first and second date is not equal return the difference

{

return difftime(second, first) / (60 * 60 * 24); // Converting time into days. difftime function for first and second date

}

return-1 ; //Anything non zero is true

}

int main(void) // Function takes no arguements

{

struct tm one = {0}, two = {0}; 

 

one.tm_year = 109; // mktime function caclculates from the year 1900 

one.tm_mon = 3 - 1; // Month input. Months start a 0 so -1 

one.tm_mday = 24; // Day of the month input 


two.tm_year = 109; // mktime function calculates from the year 1900 

two.tm_mon = 4 - 1; // Month input. Months start a 0 so -1 

two.tm_mday = 3; // Day of the month input 

printf("Number of days till deadline = %d\n", daysto(&one,&two)); // Printing the result of the calculation 

return 0;

}

Thanks in advance

The function time() will give you current time() in the same format as mktime() gives you.

--
Mats

Sorry to bring this up again so long after I posted, but i am still struggling with this problem. I have tried to include time() into the code, but I'm not sure how I should edit this part of the code:

Code:

 

one.tm_year = 109; // mktime function caclculates from the year 1900 

one.tm_mon = 3 - 1; // Month input. Months start a 0 so -1 

one.tm_mday = 24; // Day of the month input

This is the bit which i want to always be todays date. Would i just leave each one as 'one.tm_mon' or do i need some kind of variable for each part?

Sorry if this is a stupid question, just can't get my head around it!

Code:

  time_t t;
  struct tm one;

  time(&t);

  one = *localtime(&t);

   // If needed, set hours, minutes and seconds to zero.

Sorry all, I'm giving away fish here

--
Mats

ahh it works! thank you

You do what you gotta do, Mats.

It's great watching you land 'em!