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#include <time.h>
 
void func(void) {
  struct tm time_tm;
  /* Initialize tim *time_tm) */{
  char *time = asctime(&time_tm);
  /* ... */
}

#include <time.h>
 
int validate_tm(struct tm* time) {
  /* 
   * The range of valid values of the tm_sec member is [0, 60] 
   * inclusive (to allow for leap seconds).
   */
  if (time->tm_sec < 0 || time->tm_sec > 60) return 0;
  if (time->tm_min < 0 || time->tm_min >= 60) return 0;
  if (time->tm_hour < 0 || time->tm_hour >= 24) return 0;
  if (time->tm_mday <= 0 || time->tm_mday > 31) return 0;
  if (time->tm_mon < 0 || time->tm_mon >= 12) return 0;
  /* Other years are legit but may overflow asctime()'s buffer */
  if (time->tm_year < -999 || time->tm_year > 9999) return 0;
  if (time->tm_wday < 0 || time->tm_wday >= 7) return 0;
  if (time->tm_yday < 0 || time->tm_yday >= 366) return 0;
  return 1;
}
 
void func(void) {
  struct tm time_tm;
  /* Initialize time_tm) */{
  if (!validate_tm(&time_tm)) {
    /* Handle error */
  }
  char *time = asctime(&time_tm);
}

#define __STDC_WANT_LIB_EXT1__ 1
#include <time.h>
 
void func(void) {
  struct tm *time_tm;) {
  const size_t maxsize = 26; 
  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;
  char s[maxsize];
  /* Current time representation for locale */
  const char *format = "%c";
  const struct tm *timeptr;

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