Gramotki provides a calendar window allowing date data to be dragged
and dropped to any note. The date will appear in the short or
long format as specified in Preferences; by holding the shift
key down (while dragging), the opposite format will be used.
How to create calendar
Select Add Calendar from the Special menu
How to remove calendar
Just close calendar window
You can use Copy command in the Edit menu to copy calendar in a tab-delimited format. This is specially handy when you design printed calendars.
Shift-Copy will rotate tab-delimited calendar 90 degree CCW.