iCloud: Calendar overview
When you use iCloud Calendar, you can easily share your calendars with other iCloud users. For example, you can create a shared calendar called “Kids” to keep family members in the loop about school and weekend activities. For more information, see Share a calendar with others.
Calendar alerts also appear in Notification Center on your iOS devices and Mac computers.
Access iCloud Calendar from a web browser
If you only see Pages, Numbers, Keynote, and Settings on iCloud.com, your account just has access to iCloud web-only features. To gain access to iCloud Calendar and other iCloud features, set up iCloud on your iOS device or Mac.
If you’re already using another iCloud app, click the app’s name at the top of the iCloud.com window, then click Calendar.
When accessing iCloud Calendar, make sure you use a browser recommended in the Apple Support article System requirements for iCloud.