std::chrono::time_point<Clock,Duration>::time_since_epoch duration time_since_epoch()const; (since C++11) (constexpr since C++14) Returns adurationrepresenting the amount of time between*thisand theclock's epoch
converts time since epoch to calendar time expressed as Coordinated Universal Time (UTC) (function) localtimelocaltime_rlocaltime_s (C23)(C11) converts time since epoch to calendar time expressed as local time (function) mktime converts calendar time to time since epoch ...
time_since_epoch()挂钟时间是双射吗?也就是说,是否可以有两个值std::chrono::local_time::time_since_spoch()代表相同的挂钟/日历时间? 我在通常的地方找不到有关解释的详细信息std::chrono::local_time::time_since_spoch():cppreference、最新的 C++ 标准草案或 Howard Hinnant 的日期库文档。 您可能会...
time_since_epoch returns the time point as duration since the start of its clock (public member function) operator+=operator-= modifies the time point by the given duration (public member function) operator++operator++(int)operator--operator--(int) ...
struct tm* localtime_r( const time_t* timer, struct tm* buf ); (2) (since C23) struct tm* localtime_s( const time_t* restrict timer, struct tm* restrict buf ); (3) (since C11) 1) Converts given time since epoch (a time_t value pointed to by timer) into calendar time, ...
ENGMT 是一个 时区，也指一种 时制。很久以前，科学家通过天文观察，将一个太阳日定义为 86400 秒，...
time_since_epoch().count(); 这里time_since_epoch()的返回值是类型是时间长度(duration类型),即从纪元起点到now对应时间点间的时间长度。时间长度类型可以通过count()转化为数值类型,方便进一步在其他代码中使用 类型转换与时间计算 在介绍类型转换之前,我们先进一步明确time_point这一类型,完整定义是 // time_...
查看概述 https://en.cppreference.com/w/cpp/chrono 但是,“传统”日历调用通常就足够了。例如,如果您有 std::chrono::system_clock::time_point,则可以使用 std::chrono::system_clock::to_time_t() 为其获取 time_t。然后,您可以使用 std::localtime 将 time_t 分解为当地的秒/分钟/小时/日/...
std::chrono::time_point用于表示一个时间点,需要为时间点指定参考时钟(clock,clock类需要满足指定要求,详见https://zh.cppreference.com/w/cpp/named_req/Clock)和相对于参考时钟步进值。它被实现成如同存储一个 Duration 类型的自 Clock 的纪元起始开始的时间间隔的值。 template <class Clock, class Duration ...
Atime_pointrepresents a point in time that is relative to the epoch of a clock. Syntax C++نسخ template<classClock,classDuration=typenameClock::duration>classtime_point; Remarks The clock that supplies the reference point for the epoch is specified by the template argumentClock. ...