1. //由于使用了windows.h，所以这种方法只能在windows系统下使用，不能在Mac或linux下使用 
   

    #include "iostream"        #include "windows.h"        #include "string"        using namespace std;                int main(){            SYSTEMTIME ct;            GetLocalTime(&ct);;//如果用GetSystemTime(&ct),则获取的是格林尼治时间                    int year = ct.wYear;             int month = ct.wMonth;            int day = ct.wDay;            int hour = ct.wHour;            int minute = ct.wMinute;            int second = ct.wSecond;                        cout << year << "/" << month << "/" << day << " "                << hour << ":" << minute << ":" << second << endl;                    //把时间转换成字符串            char tmp[100];            sprintf_s(tmp, "%d/%d/%d %d:%d:%d", year, month, day, hour, minute, second);                    string s = tmp;            cout << s << endl;            cout << tmp << endl;                    return 0;        }