You might want to be able to view week numbers in Google Calendar, but Google haven't released such a feature yet. Maybe you've used the ISO8601 calendar, or even made your own week numbers, but in my opinion using a day event to display the week is kinda ugly, I'm sure that many of you agree.
Recently Google released a new feature; Web Content Events, it gives GCal the possibility to display events in the title bar of each day. Apparently you can only add those kind of entries through uploading an iCal file/using Google Calendar API, which maybe not the majority of the GCal users can do.
To get to the action; I've created a Google Calendar which display week numbers in the title bar in the beginning of each week, which is far better than any alternative I've tried. Click here for live preview. You can subscribe to the calendar here (or here if your week start with Sundays). (Hover your mouse on the image to the right to get a bigger image)
Pretty neat huh? I suggest you add it right away. Enjoy! And Google, if you see this; please implement week numbers, there is a huge demand for it, even though not everyone complains.
If you are unable to add the calendar using the links above (e.g if you're using Google Apps), you can still search for the calendar inside Google Calendar. The search string [week numbers web content event] should show my week number calendars on top.
Please feel free to send feedback or just mail to tell me how much you needed this :) Or you can just click the link to the right and you'll be able to anonymously chat with me live, if I'm online. If you're feeling really grateful, feel free to send me a postcard (with an image of your hometown) to: Stefan Sundin, Vänortsvägen 9, 97754 LULEÅ, Sweden.
Update 2008-08-12: I've updated the calendars and added weeks throughout 2013. I also corrected an error in the sunday calendar, the weeks was offset by one in 2009. I fixed that and now both the calendars follow the ISO standard.
Update 2007-09-28: Well, I've uploaded the rest of the new images. And since I forgot to backup the old ones, I can't restore them for those who want. If anyone want me to use new images, you can mail me with images you've made yourself and I'll consider using them. If you want a template you can use the psd file I got with the current images. Please use png and name the images "week##.png", don't zero-pad the number for the first nine weeks.
Update 2007-08-23: I've added new images for weeks 34-53, the icons was submitted by Francis. Spam me if you don't like them and I'll change back to the old ones. If I don't get any complaints I'll upload the images for the rest of the weeks and everyone will be happy :)
How I made it
I thought about this for a while, without really doing anything. When I finally got to it, I checked the Google Calendar documentation for information how I could add Web Content Events... The iCal solution looked pretty simple, so I decided to try it first.
I created a test iCal file with one entry, which worked. After a few tries I finally got a format I liked, and made a quick php-script to generate events for an entire year. Each week has a 16×16 image associated with it which is displayed in the title bar.
I uploaded all the week images to Google Pages (the same place where this site is hosted), generated weeks from January 2006 to December 2009 (now 2013), and uploaded them to a new calendar, which you now can use.
You can get the generated iCal files here, and the php-script I made to generate them here.
If you are going to do something similar you should read up on weeks, it's not as simple as you might think, e.g., do you know which year have 53 weeks instead 52 weeks? Wikipedia has a perfect explanation.
As always, send any feedback my way! :)