Firstly, thank you for taking the time to read this thread -- I do appreciate it!

I just wanted to ask, as a London-based Brit looking to book an AA seat at around +331, at what exact time of day US time (and, I guess, at what type of US time, e.g. Eastern, Pacific, etc.? ) does AA advance there award calendar by one day each day? For instance, I know KrisFlyer's calendar moves forward by one day at 00:00 GMT each day, so I just wondered if AA's award calendar worked to an exact time of day too?

Any help would be greatly appreciated!

Many thanks for reading once again!