#include <time.h>

 char *asctime(const struct tm * tm );

 

  char *asctime_r(const struct tm * tm , char * buf ); 

    char *ctime(const time_t * timep ); 
 

  char *ctime_r(const time_t * timep , char * buf ); 

    struct tm *gmtime(const time_t * timep ); 
 

  struct tm *gmtime_r(const time_t * timep , struct tm * result ); 

    struct tm *localtime(const time_t * timep ); 
 

  struct tm *localtime_r(const time_t * timep , struct tm * result ); 

    time_t mktime(struct tm * tm ); 

struct tm {


  int tm_sec;   /* seconds */


 int tm_min;   /* minutes */


 int tm_hour;  /* hours */


 int tm_mday;  /* day of the month */


 int tm_mon;   /* month */


 int tm_year;  /* year */


 int tm_wday;  /* day of the week */


 int tm_yday;  /* day in the year */


 int tm_isdst;  /* daylight saving time */


};


  

tm_sec

The number of seconds after the minute, normally in the range 0 to 59,
but can be up to 61 to allow for leap seconds.

tm_min

The number of minutes after the hour, in the range 0 to 59.

tm_hour

The number of hours past midnight, in the range 0 to 23.

tm_mday

The day of the month, in the range 1 to 31.

tm_mon

The number of months since January, in the range 0 to 11.

tm_year

The number of years since 1900.

tm_wday

The number of days since Sunday, in the range 0 to 6.

tm_yday

The number of days since January 1, in the range 0 to 365.

tm_isdst

A flag that indicates whether daylight saving time is in effect at the
time described.  The value is positive if daylight saving time is in
effect, zero if it is not, and negative if the information is not
available.



The call
ctime( t ) is equivalent to
asctime(localtime( t )) . It converts the calendar time t into a string of the form