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std::time

STD：时间

Defined in header ​​
std::time_t time( std::time_t* arg ​​

返回当前日历时间，该时间编码为std::time_t对象，并将其存储在arg，除非arg为空指针。

参数

arg-pointer to a std::time_t object to store the time, or a null pointer

返回值

当前日历时间编码为std::time_t反对成功，(std::time_t)(-1)关于错误。如果arg，则返回值也存储在arg...

注记

日历时间的编码std::time_t未指定，但大多数系统都符合POSIX规范并返回一个整数类型的值，该值包含自时代.在下列情况下std::time_t是一个32位有符号整数%28许多历史实现%29在2038年失败.

例

二次

#include <ctime>
#include <iostream>
 
int main()
{
    std::time_t result = std::time(nullptr
    std::cout << std::asctime(std::localtime(&result))
              << result << " seconds since the Epoch\n";
}

二次

产出：

二次

Wed Sep 21 10:27:52 2011
1316615272 seconds since the Epoch

二次

另见

localtimeconverts time since epoch to calendar time expressed as local time (function)
gmtimeconverts time since epoch to calendar time expressed as Universal Coordinated Time (function)
system_clock (C++11)wall clock time from the system-wide realtime clock (class)

c时间文件

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