{"adoption": {"forks": 258, "observed_at": "2026-08-28T04:05:41.322277+00:00", "stars": 1826}, "canonical_url": "https://ross.abutalabs.com/products/tz", "card": {"archived": false, "artifact_type": "dataset", "description": "Time zone database and code", "domain": ["developer-tools", "operating-systems", "cross-platform"], "enriched": true, "function": ["date-time", "parser", "developer-tools"], "health_score": 80, "homepage": "https://www.iana.org/time-zones", "language": "C", "license": "NOASSERTION", "license_family": "other", "maturity": "active", "member_repos": ["eggert/tz"], "name": "eggert/tz", "platform": ["cross-platform", "windows", "bsd", "c"], "pushed_at": "2026-08-24T17:41:55+00:00", "repo": "eggert/tz", "stars": 1826, "tags": ["timezone-database", "zoneinfo", "tzdata", "daylight-saving-time", "utc-offsets", "iana", "localization", "linux", "macos"], "topics": [], "urls": [], "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"], "what_it_is": "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.", "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"], "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"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/tz", "repo": "eggert/tz", "role": "main", "score": 77}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:05:41.322277+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-30T03:19:34.219055+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "38b3f33eaddff624727c5bb238542bf448b1b5f446a31085c1ce34942819d328", "fetched_at": "2026-08-28T04:05:41.322277+00:00", "kind": "readme", "missing": false, "url": "https://github.com/eggert/tz"}, {"content_hash": "ebf3473afb8c51585c7d73b92cc5893b904b6ba70dadb7a8bb478859cf55bab3", "fetched_at": "2026-08-29T10:58:31.407502+00:00", "kind": "homepage", "missing": false, "url": "https://www.iana.org/time-zones"}, {"content_hash": "dc4279548ef3f49f78a80338f8bebcafc8a6787a648dbdebae9dfbd84c0c1924", "fetched_at": "2026-08-29T10:58:31.409820+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about"}, {"content_hash": "e37bb6c1121395ef23785eef72aa88cc754c445cdc42dd5c5f9378345eb6a538", "fetched_at": "2026-08-29T10:58:31.416762+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about/organization"}, {"content_hash": "85b5948402afa41513fa29c3539cc592efa074ba61b744bacfd6d81b9542d76b", "fetched_at": "2026-08-29T10:58:31.411468+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases/2026c"}, {"content_hash": "0c894f5e0ec25cdd97cdefe63b50ce0d3b3fb1c49bf3defb541e03c387ed4d61", "fetched_at": "2026-08-29T10:58:31.413226+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:05:41.322277+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-30T03:19:34.219055+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "38b3f33eaddff624727c5bb238542bf448b1b5f446a31085c1ce34942819d328", "fetched_at": "2026-08-28T04:05:41.322277+00:00", "kind": "readme", "missing": false, "url": "https://github.com/eggert/tz"}, {"content_hash": "ebf3473afb8c51585c7d73b92cc5893b904b6ba70dadb7a8bb478859cf55bab3", "fetched_at": "2026-08-29T10:58:31.407502+00:00", "kind": "homepage", "missing": false, "url": "https://www.iana.org/time-zones"}, {"content_hash": "dc4279548ef3f49f78a80338f8bebcafc8a6787a648dbdebae9dfbd84c0c1924", "fetched_at": "2026-08-29T10:58:31.409820+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about"}, {"content_hash": "e37bb6c1121395ef23785eef72aa88cc754c445cdc42dd5c5f9378345eb6a538", "fetched_at": "2026-08-29T10:58:31.416762+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about/organization"}, {"content_hash": "85b5948402afa41513fa29c3539cc592efa074ba61b744bacfd6d81b9542d76b", "fetched_at": "2026-08-29T10:58:31.411468+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases/2026c"}, {"content_hash": "0c894f5e0ec25cdd97cdefe63b50ce0d3b3fb1c49bf3defb541e03c387ed4d61", "fetched_at": "2026-08-29T10:58:31.413226+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-30T03:19:34.219055+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "38b3f33eaddff624727c5bb238542bf448b1b5f446a31085c1ce34942819d328", "fetched_at": "2026-08-28T04:05:41.322277+00:00", "kind": "readme", "missing": false, "url": "https://github.com/eggert/tz"}, {"content_hash": "ebf3473afb8c51585c7d73b92cc5893b904b6ba70dadb7a8bb478859cf55bab3", "fetched_at": "2026-08-29T10:58:31.407502+00:00", "kind": "homepage", "missing": false, "url": "https://www.iana.org/time-zones"}, {"content_hash": "dc4279548ef3f49f78a80338f8bebcafc8a6787a648dbdebae9dfbd84c0c1924", "fetched_at": "2026-08-29T10:58:31.409820+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about"}, {"content_hash": "e37bb6c1121395ef23785eef72aa88cc754c445cdc42dd5c5f9378345eb6a538", "fetched_at": "2026-08-29T10:58:31.416762+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about/organization"}, {"content_hash": "85b5948402afa41513fa29c3539cc592efa074ba61b744bacfd6d81b9542d76b", "fetched_at": "2026-08-29T10:58:31.411468+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases/2026c"}, {"content_hash": "0c894f5e0ec25cdd97cdefe63b50ce0d3b3fb1c49bf3defb541e03c387ed4d61", "fetched_at": "2026-08-29T10:58:31.413226+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:05:41.322277+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:05:41.322277+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:05:41.322277+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-30T03:19:34.219055+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "38b3f33eaddff624727c5bb238542bf448b1b5f446a31085c1ce34942819d328", "fetched_at": "2026-08-28T04:05:41.322277+00:00", "kind": "readme", "missing": false, "url": "https://github.com/eggert/tz"}, {"content_hash": "ebf3473afb8c51585c7d73b92cc5893b904b6ba70dadb7a8bb478859cf55bab3", "fetched_at": "2026-08-29T10:58:31.407502+00:00", "kind": "homepage", "missing": false, "url": "https://www.iana.org/time-zones"}, {"content_hash": "dc4279548ef3f49f78a80338f8bebcafc8a6787a648dbdebae9dfbd84c0c1924", "fetched_at": "2026-08-29T10:58:31.409820+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about"}, {"content_hash": "e37bb6c1121395ef23785eef72aa88cc754c445cdc42dd5c5f9378345eb6a538", "fetched_at": "2026-08-29T10:58:31.416762+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about/organization"}, {"content_hash": "85b5948402afa41513fa29c3539cc592efa074ba61b744bacfd6d81b9542d76b", "fetched_at": "2026-08-29T10:58:31.411468+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases/2026c"}, {"content_hash": "0c894f5e0ec25cdd97cdefe63b50ce0d3b3fb1c49bf3defb541e03c387ed4d61", "fetched_at": "2026-08-29T10:58:31.413226+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:05:41.322277+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:05:41.322277+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-30T03:19:34.219055+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "38b3f33eaddff624727c5bb238542bf448b1b5f446a31085c1ce34942819d328", "fetched_at": "2026-08-28T04:05:41.322277+00:00", "kind": "readme", "missing": false, "url": "https://github.com/eggert/tz"}, {"content_hash": "ebf3473afb8c51585c7d73b92cc5893b904b6ba70dadb7a8bb478859cf55bab3", "fetched_at": "2026-08-29T10:58:31.407502+00:00", "kind": "homepage", "missing": false, "url": "https://www.iana.org/time-zones"}, {"content_hash": "dc4279548ef3f49f78a80338f8bebcafc8a6787a648dbdebae9dfbd84c0c1924", "fetched_at": "2026-08-29T10:58:31.409820+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about"}, {"content_hash": "e37bb6c1121395ef23785eef72aa88cc754c445cdc42dd5c5f9378345eb6a538", "fetched_at": "2026-08-29T10:58:31.416762+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about/organization"}, {"content_hash": "85b5948402afa41513fa29c3539cc592efa074ba61b744bacfd6d81b9542d76b", "fetched_at": "2026-08-29T10:58:31.411468+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases/2026c"}, {"content_hash": "0c894f5e0ec25cdd97cdefe63b50ce0d3b3fb1c49bf3defb541e03c387ed4d61", "fetched_at": "2026-08-29T10:58:31.413226+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:05:41.322277+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:05:41.322277+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:05:41.322277+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-30T03:19:34.219055+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "38b3f33eaddff624727c5bb238542bf448b1b5f446a31085c1ce34942819d328", "fetched_at": "2026-08-28T04:05:41.322277+00:00", "kind": "readme", "missing": false, "url": "https://github.com/eggert/tz"}, {"content_hash": "ebf3473afb8c51585c7d73b92cc5893b904b6ba70dadb7a8bb478859cf55bab3", "fetched_at": "2026-08-29T10:58:31.407502+00:00", "kind": "homepage", "missing": false, "url": "https://www.iana.org/time-zones"}, {"content_hash": "dc4279548ef3f49f78a80338f8bebcafc8a6787a648dbdebae9dfbd84c0c1924", "fetched_at": "2026-08-29T10:58:31.409820+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about"}, {"content_hash": "e37bb6c1121395ef23785eef72aa88cc754c445cdc42dd5c5f9378345eb6a538", "fetched_at": "2026-08-29T10:58:31.416762+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about/organization"}, {"content_hash": "85b5948402afa41513fa29c3539cc592efa074ba61b744bacfd6d81b9542d76b", "fetched_at": "2026-08-29T10:58:31.411468+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases/2026c"}, {"content_hash": "0c894f5e0ec25cdd97cdefe63b50ce0d3b3fb1c49bf3defb541e03c387ed4d61", "fetched_at": "2026-08-29T10:58:31.413226+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:05:41.322277+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:05:41.322277+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-30T03:19:34.219055+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "38b3f33eaddff624727c5bb238542bf448b1b5f446a31085c1ce34942819d328", "fetched_at": "2026-08-28T04:05:41.322277+00:00", "kind": "readme", "missing": false, "url": "https://github.com/eggert/tz"}, {"content_hash": "ebf3473afb8c51585c7d73b92cc5893b904b6ba70dadb7a8bb478859cf55bab3", "fetched_at": "2026-08-29T10:58:31.407502+00:00", "kind": "homepage", "missing": false, "url": "https://www.iana.org/time-zones"}, {"content_hash": "dc4279548ef3f49f78a80338f8bebcafc8a6787a648dbdebae9dfbd84c0c1924", "fetched_at": "2026-08-29T10:58:31.409820+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about"}, {"content_hash": "e37bb6c1121395ef23785eef72aa88cc754c445cdc42dd5c5f9378345eb6a538", "fetched_at": "2026-08-29T10:58:31.416762+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about/organization"}, {"content_hash": "85b5948402afa41513fa29c3539cc592efa074ba61b744bacfd6d81b9542d76b", "fetched_at": "2026-08-29T10:58:31.411468+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases/2026c"}, {"content_hash": "0c894f5e0ec25cdd97cdefe63b50ce0d3b3fb1c49bf3defb541e03c387ed4d61", "fetched_at": "2026-08-29T10:58:31.413226+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-30T03:19:34.219055+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "38b3f33eaddff624727c5bb238542bf448b1b5f446a31085c1ce34942819d328", "fetched_at": "2026-08-28T04:05:41.322277+00:00", "kind": "readme", "missing": false, "url": "https://github.com/eggert/tz"}, {"content_hash": "ebf3473afb8c51585c7d73b92cc5893b904b6ba70dadb7a8bb478859cf55bab3", "fetched_at": "2026-08-29T10:58:31.407502+00:00", "kind": "homepage", "missing": false, "url": "https://www.iana.org/time-zones"}, {"content_hash": "dc4279548ef3f49f78a80338f8bebcafc8a6787a648dbdebae9dfbd84c0c1924", "fetched_at": "2026-08-29T10:58:31.409820+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about"}, {"content_hash": "e37bb6c1121395ef23785eef72aa88cc754c445cdc42dd5c5f9378345eb6a538", "fetched_at": "2026-08-29T10:58:31.416762+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about/organization"}, {"content_hash": "85b5948402afa41513fa29c3539cc592efa074ba61b744bacfd6d81b9542d76b", "fetched_at": "2026-08-29T10:58:31.411468+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases/2026c"}, {"content_hash": "0c894f5e0ec25cdd97cdefe63b50ce0d3b3fb1c49bf3defb541e03c387ed4d61", "fetched_at": "2026-08-29T10:58:31.413226+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-30T03:19:34.219055+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "38b3f33eaddff624727c5bb238542bf448b1b5f446a31085c1ce34942819d328", "fetched_at": "2026-08-28T04:05:41.322277+00:00", "kind": "readme", "missing": false, "url": "https://github.com/eggert/tz"}, {"content_hash": "ebf3473afb8c51585c7d73b92cc5893b904b6ba70dadb7a8bb478859cf55bab3", "fetched_at": "2026-08-29T10:58:31.407502+00:00", "kind": "homepage", "missing": false, "url": "https://www.iana.org/time-zones"}, {"content_hash": "dc4279548ef3f49f78a80338f8bebcafc8a6787a648dbdebae9dfbd84c0c1924", "fetched_at": "2026-08-29T10:58:31.409820+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about"}, {"content_hash": "e37bb6c1121395ef23785eef72aa88cc754c445cdc42dd5c5f9378345eb6a538", "fetched_at": "2026-08-29T10:58:31.416762+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about/organization"}, {"content_hash": "85b5948402afa41513fa29c3539cc592efa074ba61b744bacfd6d81b9542d76b", "fetched_at": "2026-08-29T10:58:31.411468+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases/2026c"}, {"content_hash": "0c894f5e0ec25cdd97cdefe63b50ce0d3b3fb1c49bf3defb541e03c387ed4d61", "fetched_at": "2026-08-29T10:58:31.413226+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-30T03:19:34.219055+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "38b3f33eaddff624727c5bb238542bf448b1b5f446a31085c1ce34942819d328", "fetched_at": "2026-08-28T04:05:41.322277+00:00", "kind": "readme", "missing": false, "url": "https://github.com/eggert/tz"}, {"content_hash": "ebf3473afb8c51585c7d73b92cc5893b904b6ba70dadb7a8bb478859cf55bab3", "fetched_at": "2026-08-29T10:58:31.407502+00:00", "kind": "homepage", "missing": false, "url": "https://www.iana.org/time-zones"}, {"content_hash": "dc4279548ef3f49f78a80338f8bebcafc8a6787a648dbdebae9dfbd84c0c1924", "fetched_at": "2026-08-29T10:58:31.409820+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about"}, {"content_hash": "e37bb6c1121395ef23785eef72aa88cc754c445cdc42dd5c5f9378345eb6a538", "fetched_at": "2026-08-29T10:58:31.416762+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/about/organization"}, {"content_hash": "85b5948402afa41513fa29c3539cc592efa074ba61b744bacfd6d81b9542d76b", "fetched_at": "2026-08-29T10:58:31.411468+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases/2026c"}, {"content_hash": "0c894f5e0ec25cdd97cdefe63b50ce0d3b3fb1c49bf3defb541e03c387ed4d61", "fetched_at": "2026-08-29T10:58:31.413226+00:00", "kind": "site_page", "missing": false, "url": "https://www.iana.org/time-zones/releases"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 99, "longevity": 100, "rhythm": 35}, "computed_at": "2026-09-02T17:46:02.011165+00:00", "flags": ["no_releases", "no_license"], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 5159, "days_push": 9, "days_rel": null, "gap_med": null, "n_releases_24m": 0}, "score": 77, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}