All Time-Zone Database Facilities

All Time-Zone Database Facilities

A compact index of the C++ chrono time-zone database, zoned-time types, and related lookup utilities.

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 Time-Zone Database Facilities

Core zoned-time types

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

Time-zone database access

std::chrono::tzdb
std::chrono::tzdb_list
std::chrono::get_tzdb
std::chrono::get_tzdb_list
std::chrono::reload_tzdb
std::chrono::remote_version

Lookup and transition helpers

std::chrono::locate_zone
std::chrono::current_zone
std::chrono::sys_info
std::chrono::local_info
std::chrono::choose

Practical rules

Keep user-facing civil time separate from internal monotonic timing.
Expect ambiguous and nonexistent local times around daylight-saving transitions.
Validate implementation and platform support before depending heavily on time-zone database features.

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;
}