C++ mktime 更改我的 tm_struct 的值

Question

我从用户那里读取了 bMonth；

time_t timestamp = time(NULL);
tm* birthday = localtime(&timestamp);

birthday->tm_mon = bMonth-1;

// now the tm_mon is set corectly

time_t birthStamp = mktime(birthday);

// now the tm_mon is 0

为什么 mktime 会改变值？

Answer 1

mktime

A call to this function automatically adjusts the values of the members of timeptr if they are off-range or -in the case of tm_wday and tm_yday- if they have values that do not match the date described by the other members.