You don't date an annuity, you marry it. An annuity isn't a mutual fund that you buy today and sell tomorrow. Nor is it a certificate of deposit, ready for any new use at maturity. When you buy an annuity, you are making (or ought to be making) a 15- or 20-year commitment, at least.
Jane Bryant Quinn (2009). “Making the Most of Your Money Now: The Classic Bestseller Completely Revised for the New Economy”, p.1073, Simon and Schuster