Public Services and Procurement Canada
Symbol of the Government of Canada

Important notice

The Canadian Style has been archived and won’t be updated before it is permanently deleted.

For the most up-to-date content, please consult Writing Tips Plus, which combines content from Writing Tips and The Canadian Style. And don’t forget to update your bookmarks!


5.13 Representation of time of day

In documents presented in both official languages, and in all forms of international communication, it may be desirable to use the 24-hour system for representing time of day, in accordance with International Standard ISO 3307 and the Treasury Board Federal Identity Program Manual.

The hour is represented by a two-digit number ranging from 00 up to 23 (or 24), the minute and second are represented by a two-digit number ranging from 00 up to 59, and the colon is used as a separator between hour and minute and between minute and second, as illustrated:

24-hour representation

with seconds without seconds
00:15:00 00:15
08:00:00 08:00
12:00:00 12:00 (noon)
24:00:00 24:00 (midnight)
07:15:00 07:15
11:37:00 11:37
14:12:26 14:12


The instant of midnight should be represented (when seconds are included) as either 24:00:00, the end of one day, or 00:00:00, the beginning of the next day, according to circumstances.