I personally have the log window set to display time in 24hr format, but I'd like the game clock to use 12 hr.

Honestly it should adjust itself so it matches the locale/time format setting on the system it's running on. All platforms the game runs on support the ability to display the time in either 12/24 hr format, depending on the users locale or personal settings.

The /timers window always displays time in 24 hr format regardless of what language the game runs in. I think this is a bug. I reported it once but I was told it's "not a bug...". If the clock shows AM/PM the times in the /timer window should also be in AM/PM. They aren't. It's a BUG! Since this has never been corrected, I don't expect them to add support to allow the user to choose the clock display format anytime soon!