c++ - Windows时间戳(C++)

Question

我创建了Windows timestamp()函数，并通过PHP microtime()函数检查了错误的数字:

C++ = 1409802313

PHP = 1410655505

在这个休闲的C++编写的代码中:

#include <windows.h>
#include <iostream> // <--- Console I/O
#include <cstdlib> // <--- Command Line
#include <sstream>

using namespace std;

void print(string value){cout << value;}

string parseStr(int value)
{
ostringstream stream;
stream<<value<<flush;

return stream.str();
}


// ============================================================
//                         TIMESTAMP
// ============================================================
string timestamp()
{
SYSTEMTIME system_time;
GetLocalTime(&system_time);

int year = system_time.wYear;
int month = system_time.wMonth;
int day = system_time.wDay;
int hour = system_time.wHour;
int minute = system_time.wMinute;
int second = system_time.wSecond;
int milliseconds = system_time.wMilliseconds;

int day_of_year = 0;
 if (month > 1){day_of_year += 31;} // Sausis
 if (month > 2){day_of_year += 28;} // Vasaris
 if (month > 3){day_of_year += 31;} // Kovas
 if (month > 4){day_of_year += 30;} // Balandis
 if (month > 5){day_of_year += 31;} // Geguze
 if (month > 6){day_of_year += 30;} // Birzelis
 if (month > 7){day_of_year += 31;} // Liepa
 if (month > 8){day_of_year += 31;} // Rugpjutis
 if (month > 9){day_of_year += 30;} // Rugsejis
 if (month > 10){day_of_year += 31;} // Spalis
 if (month > 11){day_of_year += 30;} // Lapkritis
 if (month > 12){day_of_year += 31;} // Gruodis
day_of_year += day;

int time = 0;
time += (year - 1970) * 31536000;
time += day_of_year * 86400;
time += hour * 3600;
time += minute * 60;
time += second;

string time_string;
time_string = parseStr(time);

return time_string;
}
// ============================================================

int main()
{
 while(true)
 {
 system("cls");

 string time = timestamp();
 print(time);

 Sleep(100);
 }

return 0;
}

我会计算错误还是整数类型错误？ :(

Answer 1

错误在这里:

time += (year - 1970) * 31536000;

31536000是365天的秒数。但是自1970年以来已经有11个leap日，那年有366天。您需要为每个the日添加 86400。

您的两个结果之间的差是853192。这还不到10天，所以我不确定第11个leap日发生了什么。还不到10天3个小时(+ 8秒，我猜这是您两次测试之间的时间)；这是因为Unix时间戳基于GMT，而不是本地时间。