Wikidata:Property proposal/latest start date

latest start dateEdit

Originally proposed at Wikidata:Property proposal/Generic

Description(qualifier) latest date on which the statement could have started to be true
Data typePoint in time
Example 1Henry Percy, 3rd Earl of Northumberland (Q2521911) spouse (P26) Eleanor de Poynings, Baroness de Poynings (Q75249624) → latest start date = 25 June 1435
Example 2John de Vere, 13th Earl of Oxford (Q1332495) spouse (P26) Elizabeth Scrope (Q75252513)earliest date (P1319) = 28 November 1508; latest start date = 10 April 1509
Example 3Ælfstan (Q3880977) position held (P39) Bishop of London (Q1587771)earliest date (P1319) = 959; latest start date = 964
Planned useto represent imprecise marriage dates as presented in eg The Peerage (Q21401824)
See alsostart time (P580), earliest date (P1319), latest date (P1326), Wikidata:Property proposal/earliest end date


Suppose a source says that a marriage occurred before some date -- eg [1] "before 25 June 1435", or [2] "between 28 November 1508 and 10 April 1509". How to represent this?

In the past I have occasionally used latest date (P1326) for this, on the basis that 'of course' it must be the wedding day that such a qualifier would describe. But on further thought I feel that's not really right. In the context of a marriage, P1326 logically should indicate the latest date that the couple might still have been married. (Even if that is something that maybe we would be unlikely to often record). So a new qualifier, specifically for this case, would seem to be needed.

The qualifier would also be applicable to other statements that can take start time (P580)/end time (P582) pairs, eg noble title (P97), position held (P39), etc, etc. (sample) Jheald (talk) 21:04, 10 August 2020 (UTC)

See also: Wikidata:Property proposal/earliest end date Jheald (talk) 20:33, 11 August 2020 (UTC)


  • Proposed. Jheald (talk) 21:04, 10 August 2020 (UTC)
  •   Support there are definitely issues with the way we handle dates that could have "uncertainty" ranges right now, I think this is a reasonably approach. ArthurPSmith (talk) 18:16, 11 August 2020 (UTC)
  •   Support Gamaliel (talk) 15:20, 13 August 2020 (UTC)
  •   Support. This qualifier will be beneficial and provides a good alternative to using the most specific date precision applicable in these situations. For example, the decade 1500s is a viable way to represent "between 28 November 1508 and 10 April 1509" but it isn't really accurate enough to be satisfactory. The Extended Date/Time Format (EDTF) Specification can deal with uncertainty and approximations. Simon Cobb (User:Sic19 ; talk page) 19:03, 18 August 2020 (UTC)
@Jheald, ArthurPSmith, Gamaliel, Sic19:   Done latest start date (P8555) Pamputt (talk) 12:59, 23 August 2020 (UTC)