Challenged by dates

Dear Lowes,

I want to thank you for the offer of "No Interest if Paid in Full within 12 Months" which I received in today's mail. Today is April 26th, 2010.

Your offer states that it is valid "April 21 through April 26, 2010".

Yes, thank you so very much. Perhaps next time you could arrange for it to arrive the day after it expires just to make it completely useless, rather than almost completely useless.

This is almost as good as the coupon I got that expired on "September 31" last year.