Jc3s5h added a comment.

In https://phabricator.wikimedia.org/T88438#1059026, @thiemowmde wrote:

> > only consider parsers and validators known to the development team.
>
>
> I'm describing what the development team decided, what's currently in the 
> database and what all users of the data need to know to be able to parse them 
> correctly. It would be great if you could help updating 
> https://www.mediawiki.org/wiki/Wikibase/DataModel#Dates_and_times. You are 
> the most experienced user in this realm so far, your help is very much 
> appreciated.
>
> > does not fully "make possible to roundtrip [...]
>
>
> I did not used the word "fully". This only applies to "day vs. year" (which 
> is the by far most relevant use case) and "month vs. year" precision.


I have made changes to  
https://www.mediawiki.org/wiki/Wikibase/DataModel#Dates_and_times. Perhaps you 
could review my changes to see if you agree. One element of the TimeValue 
structure, //calendartime//, seems to be redundant so long as only the 
Gregorian and Julian calendars are supported. If we followed the original plan 
of using ISO 8601, this element would have been a useful place to store the 
converted value, but now I don't know what it's for. Perhaps if we supported 
the Roman calendar (which preceded the Julian calendar) we could use it to 
preserve an exact date such as "ninth day before the Kalends of Octobera in the 
consulship of Marcus Tullius Cicero and Gaius Antonius" for the birth date of 
Augustus; since exact conversions of Roman calendar dates are not possible, the 
//time// element could be used to indicate date in a specified proleptic 
calendar with an appropriate precision,

In any case, I think a better description of the community's vision for the use 
of //calendartime// should be give so people don't stuff the database full of 
their own private idea of what ought to go there.


TASK DETAIL
  https://phabricator.wikimedia.org/T88438

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To: thiemowmde, Jc3s5h
Cc: Tobi_WMDE_SW, gerritbot, Jc3s5h, JulesWinnfield-hu, thiemowmde, daniel, 
Aklapper, Lydia_Pintscher, Wikidata-bugs, Jdouglas, aude



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