The calendar and diary by default display times of day in the
conventional American style with the hours from 1 through 12, minutes,
and either `am' or `pm'. If you prefer the European style,
also known in the US as military, in which the hours go from 00 to 23,
you can alter the variable calendar-time-display-form. This
variable is a list of expressions that can involve the variables
12-hours, 24-hours, and minutes, which are all
numbers in string form, and am-pm and time-zone, which are
both alphabetic strings. The default value of
calendar-time-display-form is as follows:
(12-hours ":" minutes am-pm
(if time-zone " (") time-zone (if time-zone ")"))
Here is a value that provides European style times:
(24-hours ":" minutes
(if time-zone " (") time-zone (if time-zone ")"))
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