The Emacs diary keeps track of appointments or other events on a daily basis, in conjunction with the calendar. To use the diary feature, you must first create a diary file containing a list of events and their dates. Then Emacs can automatically pick out and display the events for today, for the immediate future, or for any specified date.
The name of the diary file is specified by the variable
diary-file; ~/diary is the default. Here's an example
showing what that file looks like:
12/22/2012 Twentieth wedding anniversary!! &1/1. Happy New Year! 10/22 Ruth's birthday. * 21, *: Payday Tuesday--weekly meeting with grad students at 10am Supowit, Shen, Bitner, and Kapoor to attend. 1/13/89 Friday the thirteenth!! &thu 4pm squash game with Lloyd. mar 16 Dad's birthday April 15, 2013 Income tax due. &* 15 time cards due.
This format is essentially the same as the one used by the separate calendar utility that is present on some Unix systems. This example uses extra spaces to align the event descriptions of most of the entries. Such formatting is purely a matter of taste.
Although you probably will start by creating a diary manually, Emacs provides a number of commands to let you view, add, and change diary entries.