Tom's blog

I've been using this calendar to have week number in google calendar :  http://sites.google.com/site/gcalweeknumbers/googlecalendarweeknumbers But since a few weeks it fails to load. I try to re-add it without success from the webpage. I managed to make it work again by tweaking the url : https://www.google.com/calendar/hosted/ GOOGLEAPPSDOMAIN.COM /render?cid=g0k1sv1gsdief8q28kvek83ps4@group.calendar.google.com replace GOOGLEAPPSDOMAIN.COM by your google apps domain name, paste the link in a browser that have a google apps session open, it will ask for comfirmation before adding this calendar to your calendar, click yes and you have weeks number back in your caledar!

I've found this website : http://sites.google.com/site/gcalweeknumbers/googlecalendarweeknumbers that provide a calendar that displays week numbers in you calendar which is very usefull as at work (at least in France) where we refer to week number for planning.