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The Emacs calendar knows about all major and many minor holidays.
Display holidays for the date indicated by point
Mark holidays in the calendar window (`mark-calendar-holidays').
Unmark calendar window (`calendar-unmark').
List all holidays for the displayed three months in another window
List all holidays for three months around today's date in another
To see if any holidays fall on a given date, position point on that
date in the calendar window and use the `h' command. The holidays are
usually listed in the echo area, but if there are too many to fit in
one line, then they are displayed in a separate window.
To find the distribution of holidays for a wider period, you can use
the `x' command. This places a `*' next to every date on which a
holiday falls. The command applies both to the currently visible dates
and to new dates that become visible by scrolling. To turn marking off
and erase the current marks, type `u', which also erases any diary
marks (Note: Diary.).
To get even more detailed information, use the `a' command, which
displays a separate buffer containing a list of all holidays in the
current three-month range.
You can display the list of holidays for the current month and the
preceding and succeeding months even if you don't have a calendar
window. Use the command `M-x holidays'. If you want the list of
holidays centered around a different month, use `C-u M-x holidays' and
type the month and year.
The holidays known to Emacs include American holidays and the major
Christian, Jewish, and Islamic holidays; when floating point is
available, Emacs also knows about solstices and equinoxes. The dates
used by Emacs for holidays are based on *current practice*, not
historical fact. Historically, for instance, the start of daylight
savings time and even its existence have varied from year to year.
However present American law mandates that daylight savings time begins
on the first Sunday in April; this is the definition that Emacs uses,
even though it is wrong for some prior years.
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