The Diary is one of PNote's exclusive features. It allows you to maintain the special set of notes, one per day, and leaf through them just as through real diary "pages".
By clicking on "Today" menu item you either create the new diary "page" of today - if such note does not exist, or bring up existing one. Here you can also see the "pages" of previous dates. Number of previous "pages" and other Diary related properties (notes' naming format, colors, fonts etc) are set via Diary page of Preferences dialog.
Notes belong to Diary group cannot be assigned to any other group, as well as notes from other groups cannot be assigned to Diary. They also cannot be renamed or duplicated.