Make it easy and redeem the bond with the later date but if it was issue on a date then thats the date that really matters

Problem solve... Take Care

On the bond there's two dates, the issued dated and the "dating stamp". They are a month apart, as the issued date is 20 years ago this month, and the dating stamp is for may. So what im wondering is which is the one that matters when i turn it in? I want to make sure i get my full 20 years of interest, so i don't want to end up turning it in the month early.