It is much work to search the day and open it.
Every year there is e.g. this situation: My community sends me the schedule of the various litter-events.
About 80 events a year, every years. These events I want to key in in one row.
At the moment I do this is quite comfortable: I just change the date and hit change, save, change save, change save.
The radio box allows me to change cathegory. The radio-click-event changes the panel-color into the cathegory color. So I am good oriented where I am working at.
The text line stays the same until I change it. So if there is "litter - paper" I hit save and save until I change it to "litter - plastics" and I only change one word.
Or imagine the birthdays: Everybody who uses the calendar for the first time, will have to key in all his friends at once. So there you have just to change date and name after the word "birthday" and hit again save and save..
On the screenshot you see 2 views depending on the cathegory.
Intraday gives you one option more (a TimePicker appears on click)