< cpp‎ | chrono‎ | time point
Utilities library
General utilities
Date and time
Function objects
Formatting library (C++20)
Relational operators (deprecated in C++20)
Integer comparison functions
Swap and type operations
Common vocabulary types
Elementary string conversions
(since C++11)
(constexpr since C++14)
explicit time_point( const duration& d );
(since C++11)
(constexpr since C++14)
template< class Duration2 >
time_point( const time_point<Clock, Duration2>& t );
(since C++11)
(constexpr since C++14)

Constructs a new time_point from one of several optional data sources.

1) Default constructor, creates a time_point representing the Clock's epoch (i.e., time_since_epoch() is zero).
2) Constructs a time_point at Clock's epoch plus d.
3) Constructs a time_point by converting t to duration. This constructor only participates in overload resolution if Duration2 is implicitly convertible to duration.

[edit] Parameters

d - a duration to copy from
t - a time_point to convert from

[edit] Example

#include <chrono>
#include <iostream>
using Clock = std::chrono::steady_clock;
using TimePoint = std::chrono::time_point<Clock>;
void print_ms(const TimePoint& point) 
    using Ms = std::chrono::milliseconds;
    const Clock::duration since_epoch = point.time_since_epoch();
    std::cout << std::chrono::duration_cast<Ms>(since_epoch) << '\n';
int main() 
    const TimePoint default_value = TimePoint(); // (1)
    print_ms(default_value); // 0ms
    const Clock::duration duration_4_seconds = std::chrono::seconds(4);
    const TimePoint time_point_4_seconds(duration_4_seconds); // (2)
    // 4 seconds from start of epoch
    print_ms(time_point_4_seconds); // 4000ms
    const TimePoint time_point_now = Clock::now(); // (3)
    print_ms(time_point_now); // 212178842ms

Possible output:


[edit] See also

constructs new duration
(public member function of std::chrono::duration<Rep,Period>) [edit]
converts a duration to another, with a different tick interval
(function template) [edit]