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Support Julian Date (astronomy)
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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

Details

Reference
bz57704

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bzimport raised the priority of this task from to Low.Nov 22 2014, 2:27 AM
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Jc3s5h updated the task description. (Show Details)Dec 4 2015, 8:30 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.