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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 ")"))
gives military-style times like ‘21:07 (UT)’ if time zone names are defined, and times like ‘21:07’ if they are not.