Wikidata:Property proposal/Gregorian calendar

adoption of the Gregorian calendarEdit

Originally proposed at Wikidata:Property proposal/Place

Descriptiondate the Gregorian calendar was first used
Representsadoption of the Gregorian calendar (Q18350297)
Data typePoint in time
Domaincountries, regions
Allowed valuesdates in Gregorian calendar: one per region, multiple for present-day countries (specifying "applies to part" for adoption by some of the parts of the present-day country). Most recent generally with preferred rank
Allowed unitsn/a (Gregorian calendar)
Example 1Denmark (Q35) → 1 March 1700
Example 2Sweden (Q34) → 1 March 1753
Example 3Papal States (Q170174) → 15 October 1582
Sourcesee w:List of adoption dates of the Gregorian calendar per country
Expected completenesseventually complete (Q21873974)


Wikidata (and myself) still struggle with this, but this property would allow simplified checks and retrieval from through P17. As a separate property it can include multiple values for countries. A qualifier can be used to indicate whatever calendar was used before. Items for detailed articles can be linked with "statement is subject of" (Add your motivation for this property here.) --- Jura 10:06, 1 September 2019 (UTC)


  •   Support would help a lot - Salgo60 (talk) 21:29, 2 September 2019 (UTC)
  •   Support but I'm adjusting the proposed English label to match adoption of the Gregorian calendar (Q18350297). Just "Gregorian calendar" doesn't sound like a property label. ArthurPSmith (talk) 18:49, 3 September 2019 (UTC)
    • I'm not sure. Maybe "start date"? I had removed "adopted" from the description and replaced it with "first used" to avoid a possible ambiguity with the day before, the date the adoption was decided and/or the last time the previous model calendar system was regularly used (generally the previous day except for e.g. Sweden). --- Jura 17:18, 4 September 2019 (UTC)
      • "Gregorian calendar start date" would be fine as the label too. ArthurPSmith (talk) 20:43, 4 September 2019 (UTC)
@Jura1, Salgo60, ArthurPSmith:   Done, see Gregorian calendar start date (P7295) --DannyS712 (talk) 20:45, 8 September 2019 (UTC)