c - Getting the time difference between two different times - 


gcc (gcc) 4.7.2 c89

hello,

i have developed sample program should difference between start time , end time. use seconds calculate how many days has elapsed between 2 times.

this logging application after user specified number of days. logs rolled on , new start time set. user can decide how many days log replaced.

i added small sleep general idea, logging days.

is best , portable (linux/windows) way this? potential pitfalls in design?

many suggestions,

#include <time.h> #include <stdio.h> #include <string.h>  int main(void) {     time_t start_timestamp;     time_t end_timestamp;     struct tm time_days;     double seconds = 0;     size_t cumulative_days = 0; #define format_time_size 64     char format_time[format_time_size];  #define day 3600     /* seconds in 1 day */ #define max_days 10  /* roll on log after 10 days */      /* current time of starting application */     time(&start_timestamp);     time_days = *localtime(&start_timestamp);      /* print current time @ start */     memset(format_time, 0, sizeof format_time);     strftime(format_time, sizeof format_time, "%c", &time_days);     printf("timestamp start [ %s ]\n", format_time);      /* simulate simple sleep. logging many days */     sleep(10);      /* current time after delay print results */     time(&end_timestamp);     time_days = *localtime(&end_timestamp);     memset(format_time, 0, sizeof format_time);     strftime(format_time, sizeof format_time, "%c", &time_days);     printf("timestamp end [ %s ]\n", format_time);      /* current difference in seconds */     seconds = difftime(end_timestamp, start_timestamp);     printf("seconds elapsed [ %f ]\n", seconds);      /* calculate how many days have elapsed */     cumulative_days = day * seconds;      /* going */     if(cumulative_days <= max_days) {         printf("delete log , start over\n");     }     else {         printf("not there yet, keep appending current log\n");     }      return 0; }

an alternative , arguably easier way use current day extension in log filename mylog.22, way automatic rollover , keep last month of logs.


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