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(elisp)Calendar Customizing

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Customizing the Calendar
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   If you set the variable `view-diary-entries-initially' to `t',
calling up the calendar automatically displays the diary entries for
the current date as well.  The diary dates appear only if the current
date is visible.  If you add both of the following lines to your init
file:

     (setq view-diary-entries-initially t)
     (calendar)

this displays both the calendar and diary windows whenever you start
Emacs.

   Similarly, if you set the variable
`view-calendar-holidays-initially' to `t', entering the calendar
automatically displays a list of holidays for the current three-month
period.  The holiday list appears in a separate window.

   You can set the variable `mark-diary-entries-in-calendar' to `t' in
order to mark any dates with diary entries.  This takes effect whenever
the calendar window contents are recomputed.  There are two ways of
marking these dates: by changing the face (Note: Faces), or by
placing a plus sign (`+') beside the date.

   Similarly, setting the variable `mark-holidays-in-calendar' to `t'
marks holiday dates, either with a change of face or with an asterisk
(`*').

   The variable `calendar-holiday-marker' specifies how to mark a date
as being a holiday.  Its value may be a character to insert next to the
date, or a face name to use for displaying the date.  Likewise, the
variable `diary-entry-marker' specifies how to mark a date that has
diary entries.  The calendar creates faces named `holiday-face' and
`diary-face' for these purposes; those symbols are the default values
of these variables.

   The variable `calendar-load-hook' is a normal hook run when the
calendar package is first loaded (before actually starting to display
the calendar).

   Starting the calendar runs the normal hook
`initial-calendar-window-hook'.  Recomputation of the calendar display
does not run this hook.  But if you leave the calendar with the `q'
command and reenter it, the hook runs again.

   The variable `today-visible-calendar-hook' is a normal hook run
after the calendar buffer has been prepared with the calendar when the
current date is visible in the window.  One use of this hook is to
replace today's date with asterisks; to do that, use the hook function
`calendar-star-date'.

     (add-hook 'today-visible-calendar-hook 'calendar-star-date)

Another standard hook function marks the current date, either by
changing its face or by adding an asterisk.  Here's how to use it:

     (add-hook 'today-visible-calendar-hook 'calendar-mark-today)

The variable `calendar-today-marker' specifies how to mark today's
date.  Its value should be a character to insert next to the date or a
face name to use for displaying the date.  A face named
`calendar-today-face' is provided for this purpose; that symbol is the
default for this variable.

A similar normal hook, `today-invisible-calendar-hook' is run if the
current date is _not_ visible in the window.

   Starting in Emacs 21, each of the calendar cursor motion commands
runs the hook `calendar-move-hook' after it moves the cursor.