Hello,
I'm beginning with wikidata and didn't find how to add a date which is not exact. In fact I found [1], which would gain clarity with an example, but the given format is refused when I try to use it. For example, I want to add birth and death date for Pittacus of Mytilene[2], for which I know no accurate value, but it something like -650 to -570, with something like a quarter century accuracy. Actually, looking at the English Wikipedia, -640 to -568 is given, but without sources unfortunatly. Well, for the sake of the example lets ignore that, what input should I provide to the birth day property to match my previous description?
[1] https://meta.wikimedia.org/wiki/Wikidata/Data_model#Dates_and_times [2] https://www.wikidata.org/wiki/Q311835