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(elisp)Time Display Format

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Time Display Format
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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 ")"))