strptime strftime时间函数总结

time(2)

#include <time.h>

time_t time(time_t *timep);//获取当前时间距离1970-01-01 00:00:00  经历的秒数

p = struct tm *localtime(const time_t *timep);//根据上边timep的值计算出本地时间，存放在返回指针的结构体中

其中p->tm_year + 1900,p->tm_mon + 1。

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strptime

#define _XOPEN_SOURCE /* See feature_test_macros(7) */
#include <time.h>

char *strptime(const char *s, const char *format, struct tm *tm);/0./把指定时间s按照format的格式解析到tm中。mktime(3)函数

time_t mktime(struct tm *tm);//mktime(3)根据tm可以换算出时间s距离1970-01-01 00:00:00  经历的秒数

编译的时候出现错误: warning: implicit declaration of function ‘strptime’; did you mean ‘strftime’? [-Wimplicit-function-declaration]

 解决办法:编译的时候加上-D _XOPEN_SOURCE

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strftime