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#define __STDC_WANT_LIB_EXT1__ 1
#include <time.h>
 
void func(void) {
  struct tm time_tm;
  const size_t maxsize = 26; /* or maximum size of time string */; 
  char buffer[maxsize];

  /* Initialize time_tm */
 
  if (asctime_s(buffer, maxsize, &time_tm)) {
    /* Handle error */
  }
}

#include <time.h>
 
void func(void) {
  struct tm time;
  const size_t maxsize = 26; /* or maximum size of time string */;
  char s[maxsize];
  const char *format = "%c"; /* current time representation for locale */
  const char *format = "%c";
  const struct tm *timeptr;

  size_t size = strftime(s, maxsize, format, timeptr);
}