It's Google Calendar's 5th birthday today -- On April 13th, 2006 Google Calendar was released to the world.
"What started as an experimental project by several Googlers has grown to become a service that millions of people rely on every day. From photography studios to schools to airlines to supermarkets, we discover new ways people are using Calendar all the time."
As a birthday present, the calendar team released a new "up-to-date favicon."
"When you look at the Google Calendar icon at the top of your browser window, it will no longer always display "31" but will instead change to reflect the current day of the month. Today's date is now always a short glance away."
If you don't see the new up-to-date favicon already, you should within the next couple of days.
[Source: Gmail blog]