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Date & Time. At the top of this screen, you'll see an option to turn on "24-hour time," also known as military time, in which you see "1700" instead of "5:00 p.m." (You'll see this change everywhere times appear, including at the top edge of the screen.)
"Set Automatically" refers to the iPhone's built-in clock. If this item is turned on, then the iPhone finds out what time it is from an atomic clock out on the Internet. If not, then you have to set the clock yourself. (Turning this option off makes two more rows of controls appear automatically: one for your time zone and a "number spinner" so you can set the clock.)
As for the Calendar item, here's a mind-teaser for you world travelers. If an important event is scheduled for 6:30 p.m. New York time, and you're in California, how should that event appear on your calendar? Should it appear as 3:30 p.m. (that is, your local time)? Or should it remain stuck at 6:30 (East Coast time)?
It's not an idle question, because it also affects the iPhone's reminders and alarms.
Out of the box, Time Zone Support is turned on. That is, the iPhone automatically translates all your appointments into the local time. If you scheduled a reminder to record some TV movie at 8:00 p.m. New York time, and you're in California, the reminder will pop up at 5:00 p.m. local time.
NOTE
This presumes, of course, that the iPhone knows where you are. Even though the iPhone always knows what the local time is when you travel across time zones, it can't actually determine which time zone you're in. You have to tell it each time you change time zones—by tapping Time Zone here on this screen.
If you turn Time Zone Support off, then everything stays on the calendar just the way you entered it.
02-01-2008, 08:45 PM
9:42 AM Hour in my iPhone, no changes!
Linear Mode
