I've been using my calendar like this for a couple of years, have you?
Not just dates, but blocking out time when youi need to do something. And as way to capture different bytes of information.
Today we have a windstorm of time demands blowing around our life each day. They may be captured in the following ways:
Mental: These only exist in your mind (e.g. a mental note to yourself to have pasta for dinner tonight.)
Paper: These are written (e.g. a to-do list that includes the actions assigned to you in a meeting.)
Electronic: These exist in bits and bytes (e.g. the time demands buried inside your email inbox.)
A subset of the electronic items have been assigned temporal tags. When you pull up your calendar, you are simply asking to see a slice, or view, of all electronic time demands that happen to be temporally tagged.