This is what Google Inc. says about Google Calendar: "Wouldn't it be great to be able to keep track of all the events in your life, coordinate schedules with friends and family, and find new things to do -- all with one online calendar?"
Google Calendar
Google Calendar is a free online calendar service. You can easily add events and share calendars with others. It's easy to add an event in Google Gmail thanks to the date recognition of Gmail.
Features of Google Calendar:
Share Google Calendar
You can choose to share your calendar with family, friends or colleagues
Share events
Send reminders and keep track of the invitations
Gmail integration
Gmail recognizes when e-mail messages mention events and you can easily add those events to Google Calendar
Automatic calendar reminders
Set up automatic reminders including mobile phone notifications
Quick add events
Click a spot on your calendar and start adding a new event
