You can create a NotesDocCollection by using FTSearch, you can't filter an existing DC with a search.

So, just create a FTSearch that uses date, form, and/or field criteria to get a collection of calendar docs that you want.

If I didn't understand the question, please restate it with a bit more detail.

What have you tired and why didn't that work?

What's the very first sorted column in the design?

GetAllDocumentsByKey() can filter out the calendar entries for a specific date.

Once you're there, the count of documents is pretty small, and you can look at the AppointmentType to find All-Day events.

You can also GetDocumentByKey() 'til you find the first document on/after 1/1/2014, and then continue forward from that document 'til you reach the end of the calendar. Keep in mind you can get a lot of future documents on a calendar, when it has repeating documents.