I noticed that the UK visa in my passport says 1/1/13 to 1/7/13 due to the European way of writing dates (inverting month/day). Would the people in the good ol' USA or when I land in Europe/England get confused and say my visa expired? I mean, how do I prove it is July 1 and not January 1?

I previously submitted the passport to my job (at a bank) and they sent me numerous emails about an "expired visa" until I sent them another ID.