如何在c++获取指定天数如（2015-04-04）的struct tm？

Question

比较复杂的也有想到 可是真的太复杂 结构体中每个变量都要计算 那有没有什么简便的方法呢？

Answer 1

You can only build struct or class yourself. You can search to see if there are any third-party libraries. Unlike Java, there are richer Date types.

Answer 2

Are you talking about mktime?

#include <stdio.h>
#include <time.h>
 
int main(void)
{
    struct tm tm = *localtime(&(time_t){time(NULL)});
    printf("Today is           %s", asctime(&tm));
    tm.tm_mon -= 100;  
    mktime(&tm);
    printf("100 months ago was %s", asctime(&tm));
}

Output:

Today is Sun Oct 4 19:11:45 2015
100 months ago was Mon Jun 4 19:11:45 2007