We've got a few dozen questions tagged with date.
To me, this is not a useful tag.
Who's an expert on dates? Who is going to follow this tag?
A tag should be able to describe a question all by itself. Those tagged with "date" run the gamut from how to format a date value (in a number of different apps) to how to search by date, to filtering by date range.
Before I went on a cleanup spree, I wanted to get opinions from the rest of the community.