tzcode
E179174
tzcode is the reference implementation of the time zone database, providing libraries and tools for handling time zone conversions and daylight saving time rules on Unix-like systems.
All labels observed (1)
| Label | Occurrences |
|---|---|
| tzcode canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1570049 — 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: tzcode Context triple: [Arthur David Olson, softwareProject, tzcode]
-
A.
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.
-
B.
Tsuyama, Japan
Tsuyama, Japan is a historic city in Okayama Prefecture known for its well-preserved castle ruins, traditional townscape, and famous cherry blossom viewing spots.
-
C.
Sendai
Sendai is the largest city in Japan’s Tōhoku region, known for its lush greenery, historic sites, and status as a major economic and cultural center in northeastern Honshu.
-
D.
Gifu
Gifu is a city in central Japan that serves as the capital of Gifu Prefecture, known for its historic cormorant fishing on the Nagara River and its strategic location in the Chūbu region.
-
E.
Kyushu
Kyushu is the southwesternmost of Japan’s main islands, known for its active volcanoes, hot springs, and historic cities such as Fukuoka and Nagasaki.
- 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: tzcode Target entity description: tzcode is the reference implementation of the time zone database, providing libraries and tools for handling time zone conversions and daylight saving time rules on Unix-like systems.
-
A.
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.
-
B.
Tsuyama, Japan
Tsuyama, Japan is a historic city in Okayama Prefecture known for its well-preserved castle ruins, traditional townscape, and famous cherry blossom viewing spots.
-
C.
Sendai
Sendai is the largest city in Japan’s Tōhoku region, known for its lush greenery, historic sites, and status as a major economic and cultural center in northeastern Honshu.
-
D.
Gifu
Gifu is a city in central Japan that serves as the capital of Gifu Prefecture, known for its historic cormorant fishing on the Nagara River and its strategic location in the Chūbu region.
-
E.
Kyushu
Kyushu is the southwesternmost of Japan’s main islands, known for its active volcanoes, hot springs, and historic cities such as Fukuoka and Nagasaki.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
reference implementation
ⓘ
software package ⓘ time zone library ⓘ |
| archiveFormat | tar.gz ⓘ |
| category |
system library
ⓘ
timekeeping software ⓘ |
| configuration | Makefile-based build ⓘ |
| conformsTo | POSIX time zone specifications ⓘ |
| distributedWith |
IANA time zone database
ⓘ
surface form:
IANA time zone database releases
|
| distributionForm | source code ⓘ |
| documentation |
README file in distribution
ⓘ
man pages for zic and zdump ⓘ |
| homepage | https://www.iana.org/time-zones ⓘ |
| implements |
IANA time zone database
ⓘ
IANA time zone database ⓘ
surface form:
tz database
|
| includes |
asctime.c
ⓘ
date ⓘ difftime.c ⓘ ialloc.c ⓘ leapseconds file support ⓘ localtime.c ⓘ private.h ⓘ strftime.c ⓘ tzfile.h ⓘ tzselect ⓘ zdump ⓘ zic ⓘ |
| influenced |
IANA time zone database
ⓘ
surface form:
glibc time zone implementation
many Unix-like OS time libraries ⓘ |
| license | public domain ⓘ |
| maintainedBy | IANA time zone project maintainers ⓘ |
| provides |
daylight saving time handling
ⓘ
time zone conversion libraries ⓘ time zone conversion tools ⓘ |
| relatedTo | tzdata ⓘ |
| supports | Unix-like systems ⓘ |
| supportsFeature |
daylight saving time transitions
ⓘ
future time zone rules ⓘ historical time zone rules ⓘ leap second data ⓘ |
| targetPlatform |
POSIX systems
ⓘ
Unix ⓘ Unix-like operating systems ⓘ |
| usedFor |
converting UTC to local time
ⓘ
converting local time to UTC ⓘ listing time zone transitions ⓘ testing time zone data ⓘ |
| uses | tzdata ⓘ |
| writtenIn | C ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: tzcode Description of subject: tzcode is the reference implementation of the time zone database, providing libraries and tools for handling time zone conversions and daylight saving time rules on Unix-like systems.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.