Property:Has timeline year to
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Set by the timeline record: the timeline subobject that Template:Infobox Archaeological site, Template:Infobox Historical Source, Template:Infobox Legal Instrument and Template:Infobox trade route add to their pages, which the History map and timeline read. The last year of the event, in the same form as Property:Has timeline year from: a whole number, negative before the Common Era. Equal to the first year when the event has a single date.
On an archaeological site it is finds_to, the latest date of the cannabis finds. On a trade route it is period_end; a route that is still in use and has no last year has no value here, because it runs to the present. A historical source and a legal instrument have a single year.