Originally Posted by
bluegatorade
To test out if the 5x is determined by transaction date or post date, I made a purchase at Costco on 12/30 thinking it wouldn't post until at least 1/1. Sadly I was wrong. Posted on 12/31.
I did a couple of transactions yesterday (12/31) which have yet to post. I'll update when they do so that we know for future reference.