Reader Brian Shin would like Mail to tell his preferred flavor of time. He writes:
My mailboxes do not have any time formatting, no AM/PM or my preferred 24-hour format. How can I make my mailboxes have the 24-hour format?
You make this happen through the International system preference. Just open this system preference, click the Formats tab, and click the Customize button next to Times. In the resulting sheet select Short from the pop-up menu and click on the hour numeral to reveal a pop-up menu that begins with 1-12. Choose 1-24 and click OK. You’ve now created a Custom region. When you next open Mail you’ll find that messages times are in the 24-hour format.