tm日期时间数据结构体在time.h中的定义

最新推荐文章于 2024-04-21 18:23:24 发布

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#数据结构 #include #struct #dst

本文介绍了C语言中用于表示时间的struct tm结构体及时间相关的类型定义，包括time_t和clock_t。详细解释了struct tm各字段的意义，如tm_year、tm_mon等，并给出了time_t和clock_t类型的定义。

struct tm
{
    int    tm_sec;        /* Seconds: 0-59 (K&R says 0-61?) */
    int    tm_min;        /* Minutes: 0-59 */
    int    tm_hour;    /* Hours since midnight: 0-23 */
    int    tm_mday;    /* Day of the month: 1-31 */
    int    tm_mon;        /* Months *since* january: 0-11 */
    int    tm_year;    /* Years since 1900 */
    int    tm_wday;    /* Days since Sunday (0-6) */
    int    tm_yday;    /* Days since Jan. 1: 0-365 */
    int    tm_isdst;    /* +1 Daylight Savings Time, 0 No DST,
                * -1 don't know */
};

/*
* A type for storing the current time and date. This is the number of
* seconds since midnight Jan 1, 1970.
* NOTE: Normally this is defined by the above include of sys/types.h
*/
#ifndef _TIME_T_
#define _TIME_T_
typedef long time_t;
#endif

/*
* A type for measuring processor time (in clock ticks).
*/
#ifndef _CLOCK_T_
#define _CLOCK_T_
typedef long clock_t;
#endif