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std::gmtime

STD：：gmtime

Defined in header ​​
std::tm* gmtime( const std::time_t* time ​​

将给定的时间转换为std::time_t值转换为日历时间，以协调世界时%28 UTC%29表示。

参数

time-pointer to a time_t object to convert

返回值

指向静态内部的指针std::tm对象，或NULL否则。结构可以在std::gmtime，，，std::localtime，和std::ctime并且可能会在每次调用中被覆盖。

注记

此函数可能不是线程安全的。

POSIX要求此函数集errno到EOVERFLOW如果因为争论太大而失败。

例

二次

#include <iostream>
#include <iomanip>
#include <ctime>
 
int main()
{
    std::time_t t = std::time(nullptr
    std::cout << "UTC:   " << std::put_time(std::gmtime(&t), "%c %Z") << '\n';
    std::cout << "local: " << std::put_time(std::localtime(&t), "%c %Z") << '\n';
}

二次

产出：

二次

UTC:   Wed Dec 28 11:44:28 2011 GMT
local: Wed Dec 28 06:44:28 2011 EST

二次

另见

localtimeconverts time since epoch to calendar time expressed as local time (function)

c gmtime文档

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