std::chrono::floor(std::chrono::time_point)

C++

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Date and time utilities

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C-style date and time

std::chrono::time_point

Member functions

time_point::time_point

time_point::time_since_epoch

time_point::operator+time_point::operator-

time_point::operator++time_point::operator-- (C++20)(C++20)

time_point::min

time_point::max

Non-member functions

common_type

operator+operator-

operator==operator!=operator<operator<=operator>operator>=

time_point_cast

floor (C++17)

ceil (C++17)

round (C++17)

Defined in header <chrono>
template <class ToDuration, class Clock, class Duration> constexpr time_point<Clock, ToDuration> floor(const time_point<Clock, Duration>& tp);		(since C++17)

Returns the largest time point t representable in ToDuration that is smaller or equal to tp.

The function does not participate in the overload resolution unless ToDuration is an specialization of std::chrono::duration.

Parameters

tp

-

time point to round down

Return value

d rounded down to a the next time point using duration of type ToDuration.

Possible implementation

template <class T> struct is_duration : std::false_type {}; template <class Rep, class Period> struct is_duration< std::chrono::duration<Rep, Period>> : std::true_type {}; template <class To, class Clock, class FromDuration, class = std::enable_if_t<is_duration<To>{}>> constexpr std::chrono::time_point<Clock, To> floor(const std::chrono::time_point<Clock, FromDuration>& tp) { return std::chrono::time_point<Clock, To>{ std::chrono::floor<To>(tp.time_since_epoch())}; }

See also

time_point_cast	converts a time point to another time point on the same clock, with a different duration (function template)
ceil(std::chrono::time_point) (C++17)	converts a time_point to another, rounding up (function template)
round(std::chrono::time_point) (C++17)	converts a time_point to another, rounding to nearest, ties to even (function template)
floor(std::chrono::duration) (C++17)	converts a duration to another, rounding down (function template)
floor	nearest integer not greater than the given value (function)