From what I've seen (as have you, I believe), Sony discounts the one-day freebies between 4PM and 8PM (US-ET). I suspect if you put the "full price" book into your cart and went to check out before 4PM, it would actually show up as $0 there (unless the programmers are truly incompetent). It appears that they set up a "24 hour freebie" on the book, but the servers that show the books (on the web and in the app) don't think midnight strikes until 4PM on the East Coast, US. However, the ones that regulate the cart, which also know about the promo, are set up on GMT time and end it at midnight in the UK. This has been consistently (and precisely) true of all the one-day promos that Sony has, for over a year.
Once we get off DST, I'll try to remember to check the times to see if they slid back an hour, too.
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