c语言获取系统当前时间的函数，求讲解?

Question

c语言获取系统当前时间的函数，求讲解

Answer 1

time_t是个重定义的长整型结构。
调用time函数获取时间，返回的是一个秒数。
当前时间需要调用localtime进行转换一下。
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 */
};