Support Julian Date (astronomy)
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	• iecetcwcpggwqpgciazwvzpfjpwomjxn
	Nov 28 2013, 9:24 AM

Description

The Julian Date (not to be confused with "Julian calendar" or "Julian year") is a count of the number of days that passed from Jan 1st −4712 (4713 bc) 12:00h, Julian proleptic calendar. For instance, Nov 6, 2013, 03:28:53 h UT becomes 2456602.64506 JD. It is widely use in astronomy to refer to events and epochs.

For possible implementations, check:
http://jodd.org/doc/jdatetime.html
https://github.com/oblac/jodd/blob/master/jodd-core/src/main/java/jodd/datetime/TimeUtil.java#L181

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Reference: bz57704

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Status	Assigned	Task
Open	None	T87764 Bugs related to time datatype (tracking)
Open	None	T252627 support for additional calendar models
Open	None	T59704 Support Julian Date (astronomy)

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• bzimport raised the priority of this task from to Low.Nov 22 2014, 2:27 AM

• bzimport added projects: MediaWiki-extensions-WikibaseRepository, patch-welcome.

• bzimport set Reference to bz57704.

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• iecetcwcpggwqpgciazwvzpfjpwomjxn created this task.Nov 28 2013, 9:24 AM

Lydia_Pintscher added a project: Wikidata.Dec 1 2014, 2:53 PM

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daniel mentioned this in T94064: Date of +0000-01-01 is allowed but undefined in wikibase but is not allowed in xsd:dateTime as implemented by blazegraph.May 19 2015, 4:10 PM

Jc3s5h subscribed.May 19 2015, 4:53 PM

• Filceolaire awarded a token.Aug 10 2015, 12:09 AM

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matej_suchanek added a parent task: T87764: Bugs related to time datatype (tracking).Aug 10 2015, 7:10 AM

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Addshore updated the task description. (Show Details)Dec 4 2015, 1:02 PM

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Jc3s5h updated the task description. (Show Details)Dec 4 2015, 8:30 PM

• samuwmde moved this task from incoming to needs discussion or investigation on the Wikidata board.Feb 15 2018, 4:41 PM

Liuxinyu970226 subscribed.Jun 20 2018, 4:28 AM

Aklapper mentioned this in T234950: Wrong birthday in result list of SPARQL when person was born before 1580 (Julian vs Gregorian calendar?).Oct 11 2019, 5:27 PM

• Lucas_Werkmeister_WMDE mentioned this in T206973: Supporting Solar Hijri calendar model in Wikidata.Jan 27 2020, 1:10 PM

Sannita edited parent tasks, added: T252627: support for additional calendar models; removed: T87764: Bugs related to time datatype (tracking).Nov 18 2020, 1:47 PM

I'm not sure how useful this is for Wikidata, but if we do want to support JD we may want to have the option of modified Julian date, which is more commonly used in practice in astronomy. It's a simple offset between them.

hubaishan mentioned this in T356278: Support Hijri (islamic) calendar in wikidata.Jan 31 2024, 3:49 PM

Support Julian Date (astronomy)Open, LowPublicActions

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Support Julian Date (astronomy)
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