Changing device date/time to change headquarters shop items.

So... this trick definitely works. HOWEVER, the Kindle Fire HDX, on which I have made the most progress, does not seem to allow the full use of this in that it does not allow free entry of the date. It only allows you to select time zones. So I can get a preview of what's coming tomorrow by switching zones to New Zealand or something like that (I'm currently a few hours behind GMT), and I can have a last chance at a few hours to grind medals by selecting Alaska, but that's about all. 

My current items in shop at about 0830 Feb 2 are the Brown Bess and the Bear Flag.

Time zone when set to Chatham, NZ, is currently at Feb 3rd, and is showing Bear Flag and Gaiters.

Is everybody else's - or indeed anyone else's - platform showing the same thing? If so, and if we are all in some sort of lockstep or sync for HQ shop items (or at least if they progress in some sort of fixed order), can someone with the ability to do so please look ahead in time and tell me when the following items are due to appear?

Cavalry pistol 6+
Tent 6+
Powder for artillery 6+
Napoleonic Code.




Let us please not go off track by debating the economic merits or otherwise of buying from the HQ. That's not the question being asked here.