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Timezone information in C (offset, names, etc)

/ Published in: C
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  1. #include<time.h>
  2. #include<stdio.h>
  3. #include <stdlib.h>
  4. #include <string.h>
  5.  
  6. /*
  7.   can be called in shell with:
  8.  
  9.   shell$ TZ="Europe/Rome" ./teste
  10.  
  11.  */
  12.  
  13. int main(int argc, char *argv[])
  14. {
  15.     time_t now_time;
  16.     struct tm *now;
  17.  
  18.     // Forcing timezone
  19.  
  20.     //setenv("TZ", "Europe/Rome", 1);
  21.     //tzset();
  22.  
  23.     time(&now_time);
  24.     printf("Now (unix timestamp): %ld \n\n", now_time);
  25.  
  26.     now = localtime(&now_time);
  27.  
  28.     printf(">>>> Now (gmt offset %ld): %s\n", now->tm_gmtoff, asctime(now));
  29.     printf(">>>> isDst: %d\n", now->tm_isdst);
  30.     printf(">>>> tzname: %s\n", now->tm_zone);
  31.  
  32.  
  33.     return 0;
  34. }

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