Oct 10, 2011

C Program to demonstrate time functions.

C Program to demonstrate time functions. time.h library function is used to get and manipulate date and time functions. Read more about C Programming Language .

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#include <stdio.h>  /* NULL     */
#include <time.h>  /* ctime, asctime   */

 time_t now;    /* define 'now'. time_t is probably 
  * a typedef */

 /* Calender time is the number of 
  * seconds since 1/1/1970  */

 now = time((time_t *)NULL);  /* Get the system time and put it 
  * into 'now' as 'calender time' */

 printf("%s", ctime(&now));  /* Format data in 'now'  
  * NOTE that 'ctime' inserts a
  * '\n' */


 /* Here is another way to extract the time/date information */


 printf("%s", ctime(&now));  /* Format data in 'now'  */


  struct tm *l_time;

  l_time = localtime(&now);  /* Convert 'calender time' to 
   * 'local time' - return a pointer 
   * to the 'tm' structure. localtime
   * reserves the storage for us. */
  printf("%s", asctime(l_time));


 printf("%s", asctime(localtime( &now  )));


  struct tm *l_time;
  char string[20];

  l_time = localtime(&now); 
  strftime(string, sizeof string, "%d-%b-%y\n", l_time);
  printf("%s", string);

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