问使用std::time_point将包含日期、时间和子秒的格式转换为字符串EN日期和时间格式由 日期和时间模式...
: 要格式化自定义类型,需要为类型特化std::formatter模板,并提供parse和format成员函数。这使得std::format可以以一种统一的方式处理内置类型和自定义类型。示例: struct Point { int x, y; }; template<> struct std::formatter<Point> { auto parse(format_parse_context& ctx) { return ctx.begin(); } ...
struct Param { std::string fullTime; std::string shortTime; }; class MagicTimeStringTest : public testing::TestWithParam<Param> { public: using clock = std::chrono::system_clock; static clock::time_point parse(std::string in, std::string format) { std::istringstream stream(in); std:...
using TimePoint = std::chrono::time_point<Clock, Duration>; TimePoint tp = {}; std::string time_string = std::format("{:%d.%m.%Y %H:%M:%S}", tp); This results in the compiler error:error C2672: 'std::chrono::abs': no matching overloaded function found Changi...
MWE (using gtest here) is as follows: #include <chrono> #include <format> #include <sstream> TEST(StdFormatShould, FormatTimestamp) { using Ts = std::chrono::time_point<std::chrono::system_clock, std::chrono::milliseconds>; Ts ts{0}; std...
问std::time_point从和到std::stringEN我试图替换一些使用c++20 std::chrono的boost::gregorian代码,...
time_t epoch_time = time(nullptr); cout <<"Epoch time: "<< epoch_time << endl; 其输出如下: Epoch time: 1577433897 time函数接受一个指针,指向要存储时间的对象,通常可以传递一个空指针,然后通过返回值来接受结果。 虽然标准中没有给出定义,但time_t通常使用整形值来实现。
stringserializeTimePoint(consttime_point& time,conststd::string& format){std::time_ttt =std::chrono::system_clock::to_time_t(time);std::tm tm = *std::gmtime(&tt);//GMT (UTC)//std::tm tm = *std::localtime(&tt); //Locale time-zone, usually UTC by default.std::stringstreamss...
auto current_time_t = std::chrono::system_clock::to_time_t(current_time); // 表示 current_time 的 std::time_t 值。 // std::localtime(current_time_t): 将std::time_t 对象转换为内部静态 std::tm 对象的指针。 // 按照格式字符串 format ,转换来自给定的日历时间 current_time_t 的日期...
#include <chrono> #include <string> #include <sstream> #include <iomanip> std::string FormatTime(std::chrono::system_clock::time_point tp) { std::stringstream ss; auto t = std::chrono::system_clock::to_time_t(tp); auto tp2 = std::chrono::system_clock::from_time_t(t); if (tp...