I've made a lot of good use of Wikidata for harvesting information about names in our database, including specific birth & death dates. But, when a specific date isn't known, & only a year is known, WD records that as January 1 of that year. I have to throw away any date that is January 1, as I can't be sure if it is accurate. I know there is a (rather awkward) way of recording "circa" for dates, but is there some identifier for an unknown date within the year of ____ that can be used?