eggert/tz resource

Health v2 · maintenance only

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Adoption not part of the score

1826 stars · 258 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

The IANA Time Zone Database (tzdb/zoneinfo) with its C reference implementation, containing historical and current local time rules, UTC offsets, and daylight-saving transitions for locations worldwide. It is periodically updated to reflect political changes to time zone boundaries and DST rules, and is the canonical source consumed by operating systems and software vendors.

Use cases

• convert timestamps between time zones correctly
• get current UTC offset for a city
• handle daylight saving time transitions in software
• look up historical time zone changes for a location
• compile zoneinfo files for an operating system
• track upcoming DST rule changes by country

When to choose

• you need authoritative, continuously updated time zone and DST data
• you are building an OS, runtime, or library that must resolve local times anywhere in the world
• you need historical civil time data, not just current offsets

When to avoid

• you only need simple UTC arithmetic with no local time conversion
• you want a high-level timezone API in your language rather than raw data and C code
• you need real-time clock synchronization or NTP

Facets

dataset · maturity active

date-time parser developer-tools developer-tools operating-systems cross-platform cross-platform windows bsd c timezone-database zoneinfo tzdata daylight-saving-time utc-offsets iana localization linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="eggert/tz")