time.h

struct  tm {    /* see ctime(3) */
        int     tm_sec;
        int     tm_min;
        int     tm_hour;
        int     tm_mday;
        int     tm_mon;
        int     tm_year;
        int     tm_wday;
        int     tm_yday;
        int     tm_isdst;
};

sys/time_impl.h

#if (!defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE)) || \
        (_POSIX_C_SOURCE > 2) || defined(__EXTENSIONS__)
typedef struct  timespec {              /* definition per POSIX.4 */
        time_t          tv_sec;         /* seconds */
        long            tv_nsec;        /* and nanoseconds */
} timespec_t;


sys/time.h

struct timeval {
        time_t          tv_sec;         /* seconds */
        suseconds_t     tv_usec;        /* and microseconds */
};

sys/types32.h

struct timeval32 {
        time32_t        tv_sec;         /* seconds */
        int32_t         tv_usec;        /* and microseconds */
};

typedef struct timespec32 {
        time32_t        tv_sec;         /* seconds */
        int32_t         tv_nsec;        /* and nanoseconds */
} timespec32_t;

typedef struct timespec32 timestruc32_t;

typedef struct itimerspec32 {
        struct timespec32 it_interval;
        struct timespec32 it_value;
} itimerspec32_t;