All Chrono Duration and Time-Point Utilities

All Chrono Duration and Time-Point Utilities

A compact scan page for duration arithmetic, time_point manipulation, literals, and rounding/conversion helpers from <chrono>.

How to use this reference page

Use reference pages to confirm names, categories, nearby facilities, and the constraints that matter before writing or reviewing code.

Scan the top of the page first to identify the primary types, functions, or algorithm families involved.
Use the nearby-page links when your question is really about a companion header, related algorithm family, or broader subsystem.
Validate tricky behavior with a small compileable example before relying on memory for details like invalidation, ordering, allocation, or lifetime rules.

All Chrono Duration and Time-Point Utilities

Core types

std::chrono::duration
std::chrono::time_point
duration aliases such as nanoseconds, microseconds, milliseconds, seconds, minutes, hours

Construction, conversion, and rounding

std::chrono::duration_cast
std::chrono::time_point_cast
std::chrono::floor
std::chrono::ceil
std::chrono::round

Arithmetic and comparison

duration addition and subtraction
time-point addition/subtraction with durations
time-point differences yielding durations
comparisons between durations and time points when types are compatible

Literals and common helpers

literals such as 10ms, 2s, 5min, 1h
zero, min, max on duration-like types

Practical rules

Prefer strong duration types over raw numeric timeout parameters.
Use steady_clock plus durations for elapsed timing and timeouts.
Convert units explicitly at API boundaries when precision matters.

Example in practice

#include <chrono>

int main() {
    using namespace std::chrono_literals;
    auto timeout = 150ms;
    auto next = std::chrono::steady_clock::now() + timeout;
    return next.time_since_epoch().count() > 0 ? 0 : 1;
}