I believe I found the answer:

SELECT DATEADD("D", "Number", '2017-01-01') FROM Numbers
  WHERE "Number" BETWEEN 0 AND DATEDIFF("D", '2017-01-01', '2017-04-05')

Now I just need to expand my Numbers table.  I'm wondering if anyone has a view for this.  I'd like a numbers view between 0 and 10000.  I think that should be sufficient.  Feel free to answer here, but I'll start a new topic.