Originally Posted by
bob12403
It's the check out date. This is the language on my IHG Rewards Premier Flex Free Night details: "The Anniversary Night must be redeemed, and stay must be completed within the [12 month] booking window dates shown. Ditto for the IHG Select Card Free Night: "Chase Anniversary Free Night is valid at hotels in the IHG® One Rewards Family of Brands and stay must be redeemed and completed within 12 months from date of issue." [My emphasis added.]
I just booked a night using a Flex FNC where the expiration date is the check-in date. System let me book it. Hope there's no issue upon check-out.