OK, that's a good guide. Thanks!
To everyone else:
No, unfortunately I never went to a school or had a job that used the 24 hour clock. When I went to Europe and parts of Asia I noticed that they use it there but I can't say I use it in my everyday life. I do want to start however, hence the question.
Its better to be on the ground wishing you were in the air than be in the air wishing you were on the ground. Fly safe!