[nosmohtac]

I don't use HTC Home, but I can't remember if there was a separate clock setting from within HTC Home.

If I had to guess, that's where your problem lies. If you can't find a setting in HTC Home, I'd try uninstalling HTC Home and then set your clock settings as previously described and if they are working properly at that point, reinstall HTC Home.

I could be completely off on this though.