IANA time zone database

E4894

public domain database software standard time zone database

The IANA time zone database is a globally maintained, authoritative repository of time zone information used by most modern computer systems and software to handle local times and daylight saving rules.

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All labels observed (22)

Label	Occurrences
tz database	51
IANA time zone database canonical	32
IANA Time Zone Database project	15
IANA Time Zone Database	6
IANA tz database	4
IANA tz	2
IANA Time Zone (TZ) Database	1
IANA Time Zone Database (Olson database)	1
IANA Time Zone Database (tzdb)	1
IANA Time Zone Database Project	1
IANA Time Zone Database maintainers	1
IANA time zone database mailing list and distribution site	1
IANA time zone database project	1
IANA time zone database releases	1
Olson time zone database	1
POSIX time zone conventions	1
TZDIST (Time Zone Data Distribution Service)	1
The Time Zone Information Format (TZif)	1
glibc time zone implementation	1
time zone database	1
zoneinfo database	1
zoneinfo time zone data	1

How this entity was disambiguated

This entity first appeared as the object of triple T76558 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: IANA time zone database
Context triple: [North American time zones, relatedTo, IANA time zone database]

A. North American time zones
North American time zones are the standardized regional time divisions used across countries in North America, including zones such as Eastern, Central, Mountain, and Pacific Time.
B. Moscow Time
Moscow Time is the standard time zone used in Moscow and much of western Russia, corresponding to UTC+3 year-round.
C. Time South Pacific
Time South Pacific is a regional edition of Time magazine tailored to news and issues relevant to readers in the South Pacific and surrounding Asia-Pacific areas.
D. Time Canada
Time Canada was the Canadian regional edition of the American news magazine Time, tailored with content and coverage for Canadian readers.
E. Japan Standard Time
Japan Standard Time is the standard time zone used throughout Japan, set at nine hours ahead of Coordinated Universal Time (UTC+9) without daylight saving time.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: IANA time zone database
Target entity description: The IANA time zone database is a globally maintained, authoritative repository of time zone information used by most modern computer systems and software to handle local times and daylight saving rules.

A. North American time zones
North American time zones are the standardized regional time divisions used across countries in North America, including zones such as Eastern, Central, Mountain, and Pacific Time.
B. Moscow Time
Moscow Time is the standard time zone used in Moscow and much of western Russia, corresponding to UTC+3 year-round.
C. Time South Pacific
Time South Pacific is a regional edition of Time magazine tailored to news and issues relevant to readers in the South Pacific and surrounding Asia-Pacific areas.
D. Time Canada
Time Canada was the Canadian regional edition of the American news magazine Time, tailored with content and coverage for Canadian readers.
E. Japan Standard Time
Japan Standard Time is the standard time zone used throughout Japan, set at nine hours ahead of Coordinated Universal Time (UTC+9) without daylight saving time.
F. None of above. chosen

Statements (48)

Predicate	Object
instanceOf	public domain database ⓘ software standard ⓘ time zone database ⓘ
alsoKnownAs	Olson database ⓘ tz database ⓘ linked to: IANA time zone database zoneinfo database ⓘ linked to: IANA time zone database
authority	de facto standard for time zone data ⓘ
contains	current time zone information ⓘ future time zone rule changes ⓘ historical time zone information ⓘ
coordinatedWith	ICANN ⓘ linked to: Internet Corporation for Assigned Names and Numbers
dataFormat	text files ⓘ zoneinfo binary files ⓘ
distributedAs	compiled binary data ⓘ source code ⓘ
exampleZoneName	America/New_York ⓘ Asia/Tokyo ⓘ linked to: Japan Standard Time Europe/London ⓘ
license	public domain ⓘ
maintainedBy	IANA ⓘ linked to: Internet Assigned Numbers Authority Internet Assigned Numbers Authority ⓘ
namingConvention	Area/Location ⓘ
originallyMaintainedBy	Arthur David Olson ⓘ Paul Eggert ⓘ
purpose	handle daylight saving time rules ⓘ handle local times ⓘ provide time zone information ⓘ
relatedStandard	RFC 6557 ⓘ
repositoryLocation	IANA time zone database mailing list and distribution site ⓘ linked to: IANA time zone database
scope	global ⓘ
updated	periodically ⓘ
updateTrigger	changes in civil timekeeping laws ⓘ
usedBy	.NET ⓘ linked to: .NET Framework Java ⓘ JavaScript runtimes ⓘ Linux distributions ⓘ MySQL ⓘ PHP ⓘ PostgreSQL ⓘ Python ⓘ Unix-like operating systems ⓘ browsers ⓘ macOS ⓘ many programming languages ⓘ most modern computer systems ⓘ
usedFor	converting UTC to local time ⓘ scheduling across time zones ⓘ timestamp interpretation ⓘ