Good luck. I've been using a 24 hour clock on every single device in my control for likely 30 years now and I still think in 12 hour time. Hell, I even spent ages trying to find a 24 hour bedroom clock before I finally found one on a ham radio site. But I still have to stop myself doing 12-hour time math, do the math in 24 hour, and STILL manage to screw it up.

I don't know why, but the 12 hour clock is just so ingrained that I can't stop thinking that way. The good news is, the conversion is trivial for me, but its just strange how it never 'took' in my head.