All Chrono Clocks and Calendar Types

All Chrono Clocks and Calendar Types

A compact scan page for clocks, durations, time points, calendar types, and time-zone related facilities 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 Clocks and Calendar Types

Core time abstractions

std::chrono::duration
std::chrono::time_point
std::chrono::duration_cast
std::chrono::floor
std::chrono::ceil
std::chrono::round

Clock types

std::chrono::system_clock
std::chrono::steady_clock
std::chrono::high_resolution_clock
file clock and implementation-provided clocks where supported

Calendar field types

std::chrono::day
std::chrono::month
std::chrono::year
std::chrono::weekday
std::chrono::month_day
std::chrono::month_day_last
std::chrono::year_month
std::chrono::year_month_day
std::chrono::year_month_day_last
std::chrono::year_month_weekday
std::chrono::year_month_weekday_last

Time-of-day and local/zoned facilities

std::chrono::hh_mm_ss
std::chrono::local_time
std::chrono::sys_time
std::chrono::zoned_time
std::chrono::time_zone
std::chrono::zoned_traits

Time-zone database facilities

std::chrono::get_tzdb
std::chrono::get_tzdb_list
std::chrono::reload_tzdb
std::chrono::locate_zone
std::chrono::current_zone

Practical rules

Measure elapsed time with steady_clock.
Represent user-facing timestamps with system_clock or zoned_time.
Prefer typed durations over raw integer milliseconds or seconds.

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;
}