C++11-获取当天是周期几

C++11-获取当天是周期几

C/C++中时间相关的结果大多与tm数据结构相关。

struct tm {
  int tm_sec; // seconds of minutes from 0 to 60
  int tm_min; // minutes of hour from 0 to 59
  int tm_hour; // hours of day from 0 to 23
  int tm_mday; // day of month from 1 to 31
  int tm_mon; // month of year from 0 to 11
  int tm_year; // year since 1900
  int tm_wday; // days since sunday-[0, 6]
  int tm_yday; // days since January 1st-[0, 365]
  int tm_isdst; // hours of daylight savings time
 }

获取今天星期几的代码如下：

#include <iostream>
#include <ctime>

using namespace std;

int main(int argc, const char * argv[]) {
    const string DAY[]={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
    
    time_t ttime = time(0);
    tm* local_time = localtime(&ttime);

    int weekday = local_time->tm_wday;
     cout << "Today is: " << DAY[weekday] << endl;
     return 0;
}

程序编译和执行:

g++ -std=c++11 -O2 -Wall -pedantic -pthread main.cpp && ./a.out

执行结果如下:

Today is: Wed

除了星期几之外，我们还可以获取当前的年份、月份、一个月中第几天、当前的时分秒等信息。

代码如下：

#include <iostream>
#include <ctime>

using namespace std;
 
int main() {
  time_t ttime = time(0);
  cout << "Number of seconds elapsed since January 1, 1990:" << ttime << endl;
   tm *local_time = localtime(&ttime);
    
   cout << "Year: "<< 1900 + local_time->tm_year << endl;
   cout << "Month: "<< 1 + local_time->tm_mon<< endl;
   cout << "Day: "<< local_time->tm_mday << endl;
   cout << "Week: "<< local_time->tm_wday << endl;
   cout << "Time: "<< local_time->tm_hour << ":";
   cout << local_time->tm_min << ":";
   cout << local_time->tm_sec << endl;
 }

程序编译:

g++ -std=c++11 -O2 -Wall -pedantic -pthread main.cpp && ./a.out

程序输出：

Number of seconds elapsed since January 1, 1990:1608131812
Year: 2020
Month: 12
Day: 16
Week: 3
Time: 15:16:52

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