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struct timeval {
time_t tv_sec; /* seconds */
suseconds_t tv_usec; /* microseconds */
};
time_t time(time_t *); 获取当前时间为一个长整数
char * ctime(const time_t *);将时间结构time_t转换为字符串
char * asctime(const struct tm *);将tm结构转换为字符串
struct tm * gmtime(const time_t *);将时间结构转换为tm结构 GMT
struct tm * localtime(const time_t *);将时间结构转换为tm结构 LT
time_t mktime(struct tm *);将tm结构转换为time_t结构
double difftime(time_t, time_t);将前一个减去后一个的差额
clock_t clock(void);返回从“开启这个程序进程”到“程序中调用clock()函数”时之间的CPU时钟计时单元(clock tick)数
另外tm结构如下:
struct tm {
int tm_sec; /* seconds after the minute - [0,59] * /
int tm_min; /* minutes after the hour - [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 January 1 - [0,365] * /
int tm_isdst; /* daylight savings time flag * /
};