CAN3-Z234.4-79

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.