At present, Zotero’s “date” field doesn’t properly handle publications made over a range of years (e.g., 1950–1960). Instead of including the full range in the corresponding note or bibliography entry, only the first year of the range would be presented (e.g., 1950).
There is, however, a workaround that depends on entering the following syntax in an item’s “extra” field:
issued: [first year]/[last year]
Thus, for example, if the extra field has
Zotero would properly output a range of publication dates “1950–1960.” According to the Zotero forums, “better support for various date formats in the Date field itself is planned,” but there hasn’t been any indication of when this might be forthcoming. Until then, this workaround should prove immensely useful for these kinds of situations.
For other discussion of Zotero, see these posts.