All Numeric Dates and Times
Covers the writing, typing, and printing of dates and times when
all-numeric forms are used, and is applicable for general use. It
is more restrictive than, but is not in conflict with, the
relevant ISO standards. It departs from International Standard
ISO 3307, Information interchange Representations of time of
the day, only in that the use of 24:00:00 is permitted in
addition to 00:00:00 to denote the instant of midnight.