[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

agray added a comment. @Delane13 It is possible to do this conversion within the SPARQL service - approximately, you would want something like this query

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Delane13 added a comment. In our case we have all our dates from the Julian calendar this means when our site is pulling the dates of Scottish witchcraft investigations from Wikidata, even though they are in Julian calendar, they are auto converted to Gregorian and displaying as such.

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Jc3s5h added a comment. I won't take issue issue with Delane13 changing the priority. I do think the general case for visualizing data in time is that the data about the events was originally recorded in a mixture of calendars, and usually there will be a desire to retrieve the calendar

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Delane13 added a comment. When running a query that collects dates such as this one : https://w.wiki/6rSi (Collects the date of death of accused witches). Date values in Wikidata using the Julian calendar are being displayed/converted to Gregorian calendar in the Wikidata Query service

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Delane13 raised the priority of this task from "High" to "Needs Triage". TASK DETAIL https://phabricator.wikimedia.org/T246731 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Delane13 Cc: Stinglehammer, Delane13, -jem-, AndrewNJ, Jc3s5h,

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Mahir256 merged a task: T343789: When using the Query Service Julian Dates are getting converted to Gregorian Dates. Mahir256 added subscribers: Delane13, Stinglehammer. TASK DETAIL https://phabricator.wikimedia.org/T246731 EMAIL PREFERENCES

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Epidosis raised the priority of this task from "Medium" to "High". TASK DETAIL https://phabricator.wikimedia.org/T246731 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Epidosis Cc: -jem-, AndrewNJ, Jc3s5h, Lydia_Pintscher, Epidosis, Manuel, Jheald,

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Epidosis added a comment. In my opinion this is a serious problem, since it falsifies a relevant amount of the dates extracted from Wikidata items through queries; and it is impossible to extract native Julian dates, but they can only be extracted in their conversion to Gregorian dates

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Jheald added a subscriber: Jc3s5h. Jheald added a comment. Also raised in that discussion was ticket: T207705 "Implement the Extended Date/Time Format Specification" (EDTF) EDTF (info ) is an

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Epidosis added a comment. See related T159160 , mainly T159160#3096928 . TASK DETAIL https://phabricator.wikimedia.org/T246731 EMAIL PREFERENCES

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Lydia_Pintscher added a comment. Suggestion from today's bug triage hour: create a new SERVICE that makes the date formatting and conversions easier by handling precision and calendar model instead of having to do it by hand in the query. TASK DETAIL

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Manuel added a comment. This task was discussed in the Bug Triage Hour at the Wikidata Data Quality Days 2022: - Julian dates reflected in a very confusing way on WDQS. - Considered harmful to data-checking, data re-use, data de-duplication, and data round-tripping. The task was

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Manuel added a project: Wikidata data quality and trust. TASK DETAIL https://phabricator.wikimedia.org/T246731 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Manuel Cc: Jheald, agray, Gehel, Toni_001, Lucas_Werkmeister_WMDE, Mahir256, Tagishsimon,

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

agray added a comment. After looking at this afresh I think part of my first suggestion is moot: it is possible to get an indication of the calendar model in use for a given statement by using **wikibase:timeCalendarModel** (see eg https://w.wiki/5MPi for the "point in time" of the October

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

Gehel triaged this task as "Medium" priority. TASK DETAIL https://phabricator.wikimedia.org/T246731 WORKBOARD https://phabricator.wikimedia.org/project/board/891/ EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Gehel Cc: agray, Gehel, Toni_001,

[Wikidata-bugs] [Maniphest] T246731: WDQS date handling produces errors for Julian dates

agray added a comment. A way to get access in WDQS to "original calendar" values would really be helpful. At the moment, we're in an odd situation where the dates in WDQS are technically correct by ISO 8601 (I think), but most users interested in looking at historic data won't be