Had no joy searching on FT or Marriott.com so hoping someone knows:

The cutoff dates for promotions, are these usually dates the stay has to cover, or do you need to have cheked out no later than the end date.

Last Marriott promo is case in point - expiry date of Jan 15th. With IHG then as long as checked in on 15th (and then out on 16th or later) the stay would count toward the promotion, does Marriott work in the same way, or would a stay like that fail to qualify?