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Set iCal time to 24-hour format Apps
It is not intuitive, but there is a place to change the time format in iCal to 24-hour format.

Go to System Preferences » Language & Text, denoted with a blue flag.

Choose the 'Formats' tab from the top menu. To the right of the 'Times' heading select the Customize... button. Another small window drops down and you'll see a list of time formats for Short, Medium, Long and Full formats.

Click on the small white arrow next to the hour space bubble in each of the formats and choose 0-23 to change time formats to 24-hour format. You'll notice that the Region becomes 'Custom' instead of 'United States.' Finish by selecting OK.

I had iCal open and the time stamps of my events changed immediately.

[crarko adds: I tested this, and it works as described. This may change the time display format for things other than iCal in the process, so be aware of that. There was a previous hint about setting an iPhone to stay in UTC/24-hour format as well.]
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Set iCal time to 24-hour format | 12 comments | Create New Account
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Perfect.
Authored by: chrisfriend on Aug 11, '10 08:24:16AM

Thank you. I had just noticed this morning that iCal didn't mirror the behavior of my menu-bar clock. Simple hint; expertly timed. :-)



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Set iCal time to 24-hour format
Authored by: jfa643 on Aug 11, '10 09:13:57AM

The designations of AM and PM are unnecessary when using a 24-hour clock. To display time correctly in iCal, remove the bubble with the PM (or AM) label from the panel described in this hint. Just highlight the bubble and cut.



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Set iCal time to 24-hour format
Authored by: PeterP.Syd on Aug 11, '10 10:58:44PM

Thank you, Thank you, Thank you.
I have wondered for years how I could make iCal display 24 hour formats.
Too many times I have sent out iCal Meeting invites and accidentally got the AM/PM thing wrong. Finally, I can avoid the embarrassment and repeated emails of correcting wrong meeting invites
Very useful!



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Set iCal time to 24-hour format
Authored by: poenn on Aug 12, '10 12:25:59AM

If you are living in a country that uses 24 hour format you donít have to do this, because it will be already set up this way as long as youíre using the system in that language, in my case German.

Sometimes I wonder why people use this AM/PM thing, but maybe itís just a habit...



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Set iCal time to 24-hour format
Authored by: osxpounder on Aug 25, '10 01:29:37PM

I first became accustomed to the 24-hour format while living in Germany, and ever since then, I've preferred it. Much quicker and clearer. I wish my otherwise-terrific radio alarm clock had a 24-hour setting. I hate that little dot that either means AM, or PM, depending on which clock you're looking at. Sheesh, couldn't they at least have put the light behind the letters?



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Set iCal time to 24-hour format
Authored by: Helge33 on Aug 12, '10 01:28:04AM

Why is this basic operation not intuitive? And why does this classify as a hint if you can get this info from the Apple Help?



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Set iCal time to 24-hour format
Authored by: Anonymous on Aug 12, '10 09:42:15AM
Agreed. It's not an iCal hint at all. It's a basic system preference. In fact, I believe this was the very first thing I did when I bought OS X for my old iBook SE back in the day. If only user tagging was allowed here like slashdot -- this would be tagged "rtfm" in an instant.

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Set iCal time to 24-hour format
Authored by: -hermann- on Aug 15, '10 01:19:53AM

Although this hint is not iCal specific I found it very valuable because I was not able to find this information by RTFM.
Thanks!



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Set iCal time to 24-hour format
Authored by: JackSloth on Aug 16, '10 10:00:53AM

I too feel this is not a hint but a documented feature. Who would not think that by changing the time format for the computer would change it in iCal?

---
Mac computer tech support in Montreal



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Set iCal time to 24-hour format
Authored by: RMo on Aug 16, '10 02:14:22PM

How is this not intuitive? If you can't find it in Help, you can search for it in System Preferences. It's exactly where all the other similar settings are. "This may change the time display format for things other than iCal in the process." You think? It's a system preference.



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Set iCal time to 24-hour format
Authored by: osxpounder on Aug 25, '10 01:31:34PM

You can search for lots of things... or you can come here and find a helpful hint now and then that you'd never have imagined (plus a handful of whiners complaining it's not a hint).

I'm grateful for the hints.



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Set iCal time to 24-hour format
Authored by: FlashGirl on Mar 28, '13 06:35:59AM

I am with you there, osxpounder ... why are the whiners even here? Nobody forced them to read the hint.

I found the hint very useful even if the "Format" tab is now called "Region" ... it got me started and I found the place to change it ... thank you so much.

Intuitive would have been to place a 24-hour button or something similar in the preferences of the application in question.



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