How to add week numbers to iCal on Mac OS X
To make Mac OS X show week numbers in iCal is actually not that difficult.
You simply need to add the week number to the full date notation and your done.
Goto the System preferences
Path: » System Preferences...
Goto Language & Text
Path: » System Preferences... » Language & Text
Goto the tab Formats and then click Customize...
Path: » System Preferences... » Language & Text » Formats
You will see a window where you can modify your notation format for date and time.
Now you have to put the week number of the year in the right place. Follow the red arrows 
Drag the week number to the full date field
Path: » System Preferences... » Language & Text » Formats » Customize...
Finally close all windows and check the clock on the top right.
Now start your iCal and check the date bar at the top.
As you see, its really simple to get this done
NOTE: Offset in the week number
Be sure you have the right country selected for your formats. Else you might end up with a week number with an offset. In my case the week number would be one week ahead. This cause my main country is The Netherlands and I have my system on United Kingdom. The thing you have to do is first select Dutch -> Nederlands and then change the week number. It might show weird having Dutch day names in iCal but hey... Apple made it work like this out of the box 
Update 26-07-2011:
This works only for iCal versions below 5.0 which runs on 10.7 Lion, due the iPad layout the week numbers are not possible in this way!
As a temporarily solution subscribe to one of these (open page, click subscribe button):
- For European: http://icalshare.com/calendars/195
- For Norwegian: http://icalshare.com/calendars/190
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You have no idea what you are doing to me… And I love it :)
July 16th, 2011
Doesn’t work for Indian users. Tried setting Region as India but as soon as i change the format to add the week number, region is set as Custom. The week number if offset by 1 and it shows one week ahead of actual.
August 3rd, 2011
Here is a solution which works for all iCal versions (but does not show the week number in the menu bar):
http://www.webcal.fi/xx_en/webcals.php
It is similar to the links at the end, but with more languages and has US week numbering also.
August 3rd, 2011
@Simeoni thanks for sharing
August 10th, 2011
This app is great! I’ve been using it for almost a year to measure my pets’ ages for the vet. I would be great if it was a little more editable (such as the Notes, Begin Date, and Display as Year fields) but there is nothing like it out there!
http://www.webcal.fi/xx_en/webcals.php
August 26th, 2011
The date format modification still has an effect FOR THE CURRENT DAY ONLY in the day view of iCal 5. But not for any other dates than today.
What? You’re looking for logic?
))