C++ mktime()用法及代碼示例

mktime()是一個內置的C++函數，它將本地日曆時間轉換為自紀元以來的時間，並將該值作為time_t類型的對象返回。

用法:

time_t  mktime( struct tm  *time_ptr )

參數：該函數接受強製性參數指針time_ptr，該指針指向包含要轉換的日曆時間的tm對象結構。

返回值：該函數返回兩種類型的值，如下所述：

如果傳遞的參數成功，則它將自紀元以來的時間作為類型time_t的對象返回。
失敗時返回-1。

以下示例程序旨在說明mktime()函數：

// 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; 
}

輸出：

Tha Day on 18th June 2018 was Monday

相關用法

注：本文由純淨天空篩選整理自jit_t大神的英文原創作品 mktime() function in C++ STL。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。