I admit I was skeptical before relying on it, and sought out a couple real life datapoints proving it out. You may find it implausible, but that doesn't change that it is how it works. I'm not here to convince the rest of of of anything, just inform, whether you believe me or not is irrelevant. Thought I'd share a screenshot of my account activity to help show this - you can see that my monthly statement points post on the 9th. 2 nights from the Dec. statement spend post on Dec. 10, 5 nights from holding the WOH card post on the first, and then when my Jan. statement closed, the 2x 2 night credits posted backdated to 12/31.

In an ideal world I wouldn't have run up against the deadline in this way, but I wanted to squeak out a 2nd $15k 1-4 cert last year. Only issue was my anniversary date is in Nov, so I only had 6 weeks to do the $15k spend, so having most of December was a help.

Happy Hyatting