C ++ mktime改变了我tm_struct价值 [英] C++ mktime changes value of my tm_struct

问题描述

我从读取用户bMonth;

I read bMonth from user;

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改变价值观？

Why mktime changes the values?

推荐答案

mktime

这个函数的调用自动调整的值
  timeptr成员如果它们是偏离范围或-in tm_wday的情况下
  和tm_yday-如果它们具有不匹配所描述的日期值
  由其他成员。

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.

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