localtime64_r() — Convert Time (Restartable)

Format 

#include <time.h>
struct tm *localtime64_r(const time64_t *timeval, struct tm *result);

Language Level: ILE C Extension

Threadsafe: Yes.

Locale Sensitive: The behavior of this function might be affected by the LC_TOD category of the current locale.

Description

This function is the restartable version of localtime64(). It is the same as localtime64() except that it passes in the place to store the returned structure result.

Notes:
  1. The gmtime64() and localtime64() functions might use a common, statically allocated buffer for the conversion. Each call to one of these functions might alter the result of the previous call. The asctime_r(), ctime64_r(), gmtime64_r(), and localtime64_r() functions do not use a common statically allocated buffer to hold the return string. These functions can be used in place of the asctime(), ctime64(), gmtime64(), and localtime64() functions if thread safety is desired.
  2. Calendar time is the number of seconds that have elapsed since EPOCH, which is 00:00:00, January 1, 1970 Universal Coordinate Time (UTC).
  3. The supported date and time range for this function is 01/01/0001 00:00:00 through 12/31/9999 23:59:59.

Return Value

The localtime64_r() function returns a pointer to the structure result. If the given timeval is out of range, a NULL pointer is returned and errno is set to EOVERFLOW.

Example that uses localtime64_r()

This example queries the system clock and displays the local time. 

#include <stdio.h>
#include <time.h>
 
int main(void)
{
   struct tm newtime;
   time64_t ltime;
   char buf[50];
 
   ltime = time64(&ltime);
   localtime64_r(&ltime, &newtime);
   printf("The date and time is %s\n", asctime_r(&newtime, buf));
}
 
/**************  If the local time is 3 p.m. February 15, 2008, **********
*************************  the output should be: *********************
 
The date and time is Fri Feb 15 15:00:00 2008
*/

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