I actually prefer the 24 hr clock (or "military time" as it seems to be known here in the USA.) It's just easier - if someone says they arrived somewhere at 11:00, here in the USA you have to ask them was that AM or PM? If everyone used the 24 hr clock, you would know that 1100 was a morning time while 2300 meant they got there at night! (I run into this all the time as a AAA dispatcher, so it is a bit of a pet peeve for me.
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Holly