A data point for you: I live in Asia and have run into this *numerous* times on the mobile app. This said, the error usually appears on the main calendar selection screen but then when you click through, the real date is shown. See images below for an example I literally just did on the mobile app. It's clear to see the problem; the calendar selection in the first photo says lowest miles flight on Saturday is 30k, but when you pick the 12.5k flight on Friday, it's actually for Saturday... Quite confusing and it's something I *always* have in the back of my head when I browse for prices on the mobile app. (I will say that I have not run into it on the website...)