C++ mktime()用法及代码示例

mktime()是一个内置的C++函数，它将本地日历时间转换为自纪元以来的时间，并将该值作为time_t类型的对象返回。

用法:

time_t  mktime( struct tm  *time_ptr )

参数：该函数接受强制性参数指针time_ptr，该指针指向包含要转换的日历时间的tm对象结构。

返回值：该函数返回两种类型的值，如下所述：

如果传递的参数成功，则它将自纪元以来的时间作为类型time_t的对象返回。
失败时返回-1。

以下示例程序旨在说明mktime()函数：

// CPP program to demonstrate the 
// mktime() function 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    time_t tim; 
    tm* time_ptr; 
    char weekday[7][20] = { "Sunday", 
                            "Monday", 
                            "Tuesday", 
                            "Wednesday", 
                            "Thursday", 
                            "Friday", 
                            "Saturday" }; 
  
    // Date 
    int year = 2018; 
    int month = 6; 
    int day = 18; 
  
    time(&tim); 
    time_ptr = localtime(&tim); 
  
    // tm_year is time since 1900 
    time_ptr->tm_year = year - 1900; 
  
    // Months calculated since January 
    time_ptr->tm_mon = month - 1; 
  
    // Day calculated in the month 
    time_ptr->tm_mday = day; 
  
    // time_ptr pointer to be pass 
    mktime(time_ptr); 
  
    cout << "Tha Day on 18th June 2018 was "
         << weekday[time_ptr->tm_wday]; 
  
    return 0; 
}

输出：

Tha Day on 18th June 2018 was Monday

相关用法

注：本文由纯净天空筛选整理自jit_t大神的英文原创作品 mktime() function in C++ STL。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。