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39.15.3 Date Display Format

You can customize the manner of displaying dates in the diary, in mode lines, and in messages by setting calendar-date-display-form. This variable holds a list of expressions that can involve the variables month, day, and year, which are all numbers in string form, and monthname and dayname, which are both alphabetic strings. In the American style, the default value of this list is as follows:

 
((if dayname (concat dayname ", ")) monthname " " day ", " year)

while in the European style this value is the default:

 
((if dayname (concat dayname ", ")) day " " monthname " " year)

The ISO standard date representation is this:

 
(year "-" month "-" day)

This specifies a typical American format:

 
(month "/" day "/" (substring year -2))

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