Question

对于我正在开发的项目，我需要找到两个日期之间的差异，以检查哪个更新，我做得很好，但我发现了一个小bug。

对于使用struct tm的日期，这是代码：

struct tm firstDate, secondDate;
firstDate.tm_hour = 0;
firstDate.tm_min = 0;
firstDate.tm_sec = 0;
firstDate.tm_mon = 5;
firstDate.tm_mday = 30;
firstDate.tm_year = 2016 - 1900; //difference between current year and 1900

secondDate.tm_hour = 0;
secondDate.tm_min = 0;
secondDate.tm_sec = 0;
secondDate.tm_mon = 6;
secondDate.tm_mday = 1;
secondDate.tm_year = 2016 - 1900;

time_t fDate = mktime(&firstDate);    // 31/5/2016
time_t sDate = mktime(&secondDate);   // 1/6/2016
int diff = (difftime(fDate, sDate));

printf("%d", diff / 86400);

它适用于每个日期，除非我想比较月末（如2016年5月31日）和第二天（2016年6月1日）的日期，它会返回0天它应该返回1.但如果我将其更改为2016年5月30日它返回1天而不是2.事情可能是31天而不是30 ..所以它在几个月工作，而在其他人它不工作..有谁知道如何摆脱这个？

提前感谢，抱歉我的英语不好，这不是我的母语

Answer 1

secondDate.tm_mon中的值0而不是1将代表1月。

试试这个：

struct tm firstDate, secondDate;
firstDate.tm_hour = 0;
firstDate.tm_min = 0;
firstDate.tm_sec = 0;
firstDate.tm_mon = 5 - 1;
firstDate.tm_mday = 30;
firstDate.tm_year = 2016 - 1900; //difference between current year and 1900

secondDate.tm_hour = 0;
secondDate.tm_min = 0;
secondDate.tm_sec = 0;
secondDate.tm_mon = 6 - 1;
secondDate.tm_mday = 1;
secondDate.tm_year = 2016 - 1900;

time_t fDate = mktime(&firstDate);    // 31/5/2016
time_t sDate = mktime(&secondDate);   // 1/6/2016
int diff = (difftime(fDate, sDate));

printf("%d", diff / 86400);

C天差异1天不工作

1 个答案: